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Whether you’re planning for an upcoming wedding, prom, gala, or any other special occasion, these ethical and sustainable formal dresses will be just the fit.

A lot of formalwear is made from irresponsibly sourced silk or polyester and is worn just once. It’s time to turn that around!

This guide will share sustainable formal dress options that have frocks you can rock to weddings, dances, galas, concerts, or any other event you have coming up.

How to Find Sustainable Formal Dresses

The most sustainable garment is the one already in your closet!

Do you have a special occasion dress or piece of formalwear that could fit the bill? While wearing an outfit only once to an event has unfortunately become the norm with social media, we can help counteract the culture by normalizing outfit repeating to special occassions again!

Another sustainable option is to make the most of what already exists by borrowing from a friend or family member or swapping with someone you know has a formal dress. This is something my friends and I did for high school dances like homecoming and prom. A friend’s Junior Prom dress became my Senior Prom dress the next year!

If there’s no one with your style and size, you can also expand your search of formalwear by browsing online resale platforms. Vestiaire Collective has a fabulous selection of dresses from designer brands for great prices, as does The RealReal. I’ve used The RealReal site to purchase dresses for weddings and other occassions.

If you just need a special occasion dress for one event, consider rental sites like Rent the Runway that offer affordable ways to get formalwear for a limited time.

If none of these options are available to you or you really feel ready to invest in an extra-special garment that you can wear for years to come, keep scrolling for our list of brands with sustainable and ethical formal dresses.

Brands With Sustainable Formalwear & Special Occasion Dresses

These brands have party-perfect minis, chic cocktail dresses, elegant evening gowns, and even pieces that would make for fabulous sustainable prom dresses!

Note that this guide contains partners and affiliate links. As always, all brands meet rigorous standards for sustainability and are brands we truly love — and that we think you’ll love too!

(You might also want to check out this guide for sustainable wedding dresses or this guide for more causal eco-friendly dresses.)

1. Rare & Fair

With elegant draping and feminine detailing, Rare & Fair’s dreamy dresses are certainly eye-catching — and the story behind each piece makes them all the more beautiful. Rare & Fair partners with artisans in Thailand, working closely with village co-operatives and small family businesses. The conscious UK-based brand sources sustainably-grown cotton from small-scale farmers following ancestral agricultural practices and small-scale silk sourced from communities in Thailand using traditional methods.

Conscious Qualities: Sustainable Traditional Fibers, Local Plant-Based Dyes, Craft Preservation, Ethical Production

Size Range: XS-L

Price Range: £££ / $$$

Browse Rare & Fair

Green ethical dress from Rare & Fair

2. Christy Dawn

Christy Dawn’s dresses are vintage-inspired but totally timeless. Their feminine frocks can be worn as house dresses or semi-formal wear to weddings, bridal showers, baptisms, or other not-quite black-tie occasions. Their dresses are either made from reclaimed fabrics ethically in Los Angeles or from regenerative organic cotton that is sourced in partnership with a small collective in India.

You’ll also find sustainable special occasion dresses from Christy Dawn made with regenerative silk, like the dress pictured here!

Conscious Qualities: Reclaimed or Regenerative Fabrics, Ethical Production

Size Range: XS-3XL (extended sizing collection)

Price Range: $$$

Browse Christy Dawn

3. Reformation

Reformation is a leader on sustainability among larger fashion brands, between their climate positive roadmap and better material sourcing (including recycled cotton, TENCEL Lyocell, and regenerative fabrics) to their supply chain transparency, limited production model, and circularity practices.

And the brand is making it easy to shop for sustainable special occasion dresses with their selection features like “Going Out Dresses” and “Wedding Guest Dresses”.

Conscious Qualities: Lower Impact Materials, Responsible Production Practices, Decarbonization Initiatives

Size Range: 0 – 12

Price Range: $$ – $$$

Browse Reformation

red floral sustainable formal dress from Reformation

4. Bastet Noir

Making each piece to order using upcycled materials, Bastet Noir is a zero-waste fashion label. The brand’s sustainable formal dresses and other elegant apparel — including silk jumpsuits — are made by women in North Macedonia. 100% of Bastet Noir’s profits are reinvested into the women’s businesses and their children’s education.

Conscious Qualities: Repurposed Materials, Made-to-Order, Gives Back

Size Range: 4-10 + custom sizes

Price Range: $

Browse Bastet Noir

Red silk jumpsuit - sustainable eveningwear

5. AMUR

Standing for A Mindful Use of Resources, AMUR uses earth-minded fabrics including hemp, linen, cupro (a silky fiber made from cotton linter, a byproduct of cotton production), modal, and recycled polyester. AMUR has some seriously stunning gowns that would make for great sustainable prom dresses or black tie-dress code outfits. AMUR could use more information on their labor standards and production practices though.

Conscious Qualities: Earth-Minded Fabrics

Size Range: XXS-XL

Price Range: $$$$

Browse AMUR

Green sustainable dress from Amur

6. Whimsy + Row

Sourcing lower impact fabrics like TENCEL + cupro vegan silk blend, certified organic cotton, and excess leftover fabric (“deadstock”), Whimsy + Row prioritizes sustainability throughout their collections.

The brand has several designs that would make for perfect sustainable bridesmaid dresses in their wedding collection! And even (vegan) silky dresses in a lovely cream for the bride.

Conscious Qualities: Eco-Minded Fabrics

Size Range: XS – 3XL

Price Range: $$ – $$$

orange sustainable bridesmaid dress formalwear from Whimsy and Row

7. BAACAL

Frustrated that brands often stop their size range at 12 despite the average American woman wearing size 16, BAACAL creates conscious clothing for the “true majority”: women who wear sizes 10-22. The plus-size sustainable fashion brand uses upcycled, vintage, and other existing materials for their collections.

Conscious Qualities: Upcycled Fabrics, Small-Batch Collections, Size-Inclusive

Size Range: 10-22 (unique sizing system of 1-4)

Price Range: $$$

Browse BAACAL

Red ethical formal dress from BAACAL

8. Symbology

Symbology partners with women artisans who handcraft beautiful, one-of-a-kind pieces. These artisans use traditional techniques such as block printing and hand-embroidery and are all paid living wages. The fair fashion label has striking dresses made with flattering silhouettes and many styles are offered up to size 3XL.

Conscious Qualities: Cultural Preservation, Fair Trade

Size Range: XS-3XL

Price Range: $$

Browse Symbology

Red sustainable dress from Symbology

9. Lahive

Bold and unique, Lahive’s stand-out dresses and other ethical formal wear will make a statement at cocktail hour or a night out downtown. The LA-based brand produces their luxe, textural pieces in small batches using upcycled materials in a factory run by solar power.

Conscious Qualities: Upcycled Fabrics, Renewable Energy, Local Production

Size Range: XS-XL

Price Range: $$$

Browse Lahive @ ourCommonplace

sustainable black formal dress from Lahive

10. LOUDBODIES

LOUDBODIES is on a mission to prove that ethically and sustainably-produced clothing can be accessible to anyone and style knows no size. In addition to offering sizes up to 10XL, the brand also offers customizations free of charge. The brand’s garments are made from low-impact fibers like linen, cupro, Ecovero Viscose responsibly by LOUNDBODIES founder Patricia and two employees.

Conscious Qualities: Eco Fabrics, Size-Inclusive, Carbon-Offset Shipping & Eco Packaging

Size Range: XXS-10XL

Price Range: $$

Browse Loud Bodies

model wearing pink flowy dress

11. Hope for Flowers

Hope for Flowers was founded on three guiding principles: the health of people, health of the planet, and equity in profit. The brand uses thoughtfully considered materials for their ethical formal dresses and other apparel like organic cotton, organic linen, and Tencel. Hope for Flowers also sources only from factories that pay living wages and ensure safe conditions.

Conscious Qualities: Black Woman-Owned, Organic & Eco Fabrics, Ethically-Made

Size Range: XS-L

Browse Hope for Flowers

White sustainable dress from Hope for Flowers

12. Cécile de Fleur

Elegant, sophisticated, and designed with sustainability in mind, Cécile de Fleur’s eco-friendly wedding dresses are designed to be worn again and again. [Check out our guide to sustainable wedding dresses here.]

The brand’s chic dresses are crafted in New York City using cruelty-free peace silk and intricate French leavers lace, and are colored with GOTS-certified dyes.

Conscious Qualities: Peace Silk, Eco Dyes & Packaging, Local Production, WOC-Owned

Size Range: 0 – 12

Price Range: $$$$

Browse Cécile de Fleur

You May Also Want to Check Out:

Eco-Friendly, Ethical, and Vegan Bags

Brands with Elegant Ethically-Made Flats

Sustainable Wedding Dresses for Your Special Day

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12 Sustainable Formal Dresses to Rock At Your Upcoming Special Occasions

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Green Living

Earth911 Inspiration: Be True to the Earth — Edward Abbey

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This week’s quote is from American novelist and pioneering environmentalist Edward Abbey: “I am not an atheist but an earthiest. Be true to the earth.”

Earth911 inspirations. Post them, share your desire to help people think of the planet first, every day. Click the poster to get a larger image.

"I am not an atheist but an earthiest. Be true to the earth." --Edward Abbey

This poster was originally published on January 31, 2020.

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Green Living

10 Books to Counter Consumerism

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We are constantly bombarded by messages that tell us we need more stuff to be happy. The average American household contains around 300,000 items. The average home size has roughly tripled since the 1950s, and we still rent self-storage units by the millions to hold the overflow.

If you are rethinking your relationship to consumer culture – whether by choice or necessity – we’ve rounded up a list of books to make breaking up with consumerism and easier to understand which of our purchases are really necessary.

(Amazon links are provided for convenience. Your local library and independent bookstore are excellent first stops.)

Empire of Things

by Frank Trentmann

Trentmann’s sweeping 2016 history follows material culture from late Ming China and Renaissance Italy through to today’s global supply chains. He shows that consumerism is not a recent American export but a centuries-long international phenomenon, one that has reshaped households, cities, and the planet.

Empire of Things is dense but never preachy, and it gives readers the long view needed to understand what we are actually pushing back against.

No Logo – 10th Anniversary Edition

by Naomi Klein

No Logo was a movement manifesto when it appeared in 1999, and its dissection of branding, sweatshop labor, and corporate cultural takeover reads as prescient now that nearly every screen on earth is an ad surface. To take the next step, pair this read with Klein’s more recent argument about capitalism and ecological collapse, How To Change Everything.

The Conscious Closet

by Elizabeth L. Cline

Cline first exposed the human and environmental costs of fast fashion in Overdressed (2012). The Conscious Closet is the practical follow-up: how to clean out, repair, swap, and rebuild a wardrobe without funding the industry that produces an estimated 92 million tons of textile waste each year. It is the most actionable book on this list for anyone with a closet.

The Myths of Happiness

by Sonja Lyubomirsky

Psychology professor Sonja Lyubomirsky brings the receipts. In The Myths of Happiness, she walks through decades of research showing that material milestones — the raise, the upgrade, the bigger house — produce short bursts of satisfaction that fade quickly. What actually sustains wellbeing is rarely for sale. A clarifying read for anyone tempted to outshop their way to contentment.

How to Do Nothing: Resisting the Attention Economy

by Jenny Odell

Waste is coming for our minds, too. Odell argues that our scarcest resource is attention — and that the platforms we use have turned it into the raw material of a trillion-dollar industry. How to Do Nothing is not a digital-detox manual; it is a case for reclaiming attention as a political act, with consequences for everything from bird-watching to civic life. More relevant in 2026 than when it was published in 2019.

Less Is More: How Degrowth Will Save the World

by Jason Hickel

Economic anthropologist Jason Hickel makes the case that endless GDP growth is incompatible with a livable planet, and that “green growth” is mostly a marketing exercise. Less Is More (2020) traces 500 years of capitalism and lays out what a degrowth economy could actually look like — one organized around human and ecological flourishing rather than perpetual expansion. The book has helped move degrowth from the margins of academia into the mainstream of the climate debate.

The Day the World Stops Shopping

by J.B. MacKinnon

Journalist J.B. MacKinnon designed The Day the World Stops Shopping (2021) as a thought experiment — what would happen if global consumption dropped by 25%? — and then watched the pandemic run a version of the experiment in real time. He travels from Namibian hunter-gatherer communities to American big-box retail, talking to economists, ecologists, and CEOs. The result is one of the most readable accounts of why we shop, why we cannot easily stop, and what we would gain if we did.

Consumed: The Need for Collective Change

by Aja Barber

Writer and consultant Aja Barber connects fashion, colonialism, and climate in Consumed (2021), a debut that has become a touchstone for the ethical fashion conversation. Where Cline writes as a practitioner, Barber writes as a systems critic, tracing the textile trade’s roots in slavery and racial inequality and asking readers to confront why we fill emotional gaps with purchases. Pointed, generous, and built to be read in two sittings.

Wasteland: The Secret World of Waste and the Urgent Search for a Cleaner Future

by Oliver Franklin-Wallis

If consumerism is the input, waste is the output we work hardest not to see. Award-winning journalist Oliver Franklin-Wallis follows that output across continents in Wasteland (2023) — from New Delhi’s landfills and Ghana’s secondhand clothing markets to nuclear storage sites and the corporate origins of curbside recycling. Named a Best Book of 2023 by The New Yorker, The Guardian, and Kirkus, it is essential reading for anyone who has ever wondered where “away” actually goes.

Fixation: How to Have Stuff Without Breaking the Planet

by Sandra Goldmark

Sandra Goldmark runs a pop-up repair shop in New York and serves as director of sustainability at Barnard College. Fixation (2020) is her plainspoken case for getting things fixed instead of replaced, and for building a circular economy where good design, reuse, and repair are the default. Her five-rule formula — borrowed in spirit from Michael Pollan — is the most quotable advice on this list: “Have good stuff. Not too much. Mostly reclaimed. Care for it. Pass it on.”

What You Can Do

Reading is a start, not a finish. A few next steps:

  • Start at the library. Most of these titles are available through WorldCat or your local branch. Borrowing keeps a book in circulation and out of a landfill.
  • Audit one category of stuff before adding to it. Pick clothes, kitchenware, or electronics. Inventory what you already own before the next purchase. Most of us own more than we remember.
  • Find a repair option in your community. Take the time to locate repair, reuse, and donation outlets near you before tossing anything broken.
  • Support right-to-repair policy. Several U.S. states have passed right-to-repair laws since 2023; the rest are weighing them. Individual purchasing choices matter more when manufacturers are required to make repair possible.
  • Read one of these books and talk about it. Anti-consumption is harder alone. Book clubs, mutual-aid groups, and faith communities have all become surprising hubs for this work.

Editor’s Note: Originally authored by Gemma Alexander on June 18, 2020, this article was updated in May 2026.

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Best of Sustainability In Your Ear: EarthX CEO Peter Simek on Cultivating Bipartisan Climate Strategies

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For 15 years, the Dallas-based climate conference the EarthX conference has created space where fossil fuel executives and environmental activists, Republican appropriations chairs and Democratic climate hawks, find common ground. The organization targets three core stakeholders: the corporate world, policymakers, and investors seeking startups where environmental solutions are baked into the bottom line. Peter Simek, EarthX’s CEO, explains how reframing climate action around shared values—stewardship, economic opportunity, and love of the land—unlocks support that crisis messaging alone cannot reach.

The doom story doesn’t sell, Simek explained. “We’re not motivated as a species by doomsday language. It puts people in fight-or-flight mode.” He points out how climate became an identity issue, tangled up in culture-war debates over hamburgers and gas-powered trucks, when the real conversation should center on clean air, clean water, and protecting the places we love. “The EPA and the Clean Air and Clean Water Act were passed during the Nixon administration,” he notes. “There are ways to message this that appeals across lines.”

Peter Simek, CEO of EarthX, is our guest on Sustainability In Your Ear.

Simek bets heavily on bottom-up action as EarthX works to build bridges. States, cities, and private capital often move faster than federal mandates, he argues, and they’re harder to reverse with a single executive order. Texas leads the nation in renewable energy deployment because wind and solar make bottom-line sense. “Even as there’s a policy turn against it, there’s still the driving reality that solar and wind are viable energy sources,” he says. A new event in 2026, the EarthX Institute, will focus on two policy priorities: nuclear energy, where bipartisan consensus is growing, and urban biodiversity.

Whether conversations at forums like EarthX translate into policy velocity that matches the pace of climate impacts remains to be seen. Simek says he stays focused on tracking downstream results, specifically the investments funded, the coalitions built, and the policies incubated from the local level up. “It’s about finding those ways in which there’s common sense, common ground, common values,” he says. “Elements to talking about nature and the environment that no one can really disagree with.”

Learn more about EarthX and its upcoming April 2026 conference at earthx.org.

Editor’s Note: This episode originally aired on December 15, 2025.

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