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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

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. Amour Vert

Translated to “Love Green”, Amour Vert is an eco-friendly fashion label with several sustainability efforts, from using lower impact materials — like TENCEL™ modal, TENCEL™ Lyocell, and washable more responsible silk sourced from bluesign® factories — to having their own resale program called ReAmour.

Amour Vert has a collection called “Occasion Ready” with more elevated dresses to wear to weddings, baby and bridal showers, parties, concerts, or other special events.

Conscious Qualities: Organic & Eco Fibers, Non-Toxic Dyes, Circular Brand

Size Range: XS-XL

Price Range: $$

Browse Amour Vert

Mustard yellow sustainable formal dress

13. 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

14. Stella McCartney

Sustainable designer label Stella McCartney utilizes mindful materials like organic cotton, recycled fabrics, and cellulosic fibers for their ready-to-wear garments. The company also uses an Environmental Profit & Loss Statement, which is a “breakthrough decision-making tool” that helps Stella McCartney take a deeper look at their environmental impact, their progress, and the ways they can improve.

Conscious Qualities: Low-Impact Materials, Transparent Reporting, Social Sustainability

Size Range: 0-8

Price Range: $$$$

Browse Stella McCartney

Black short ethical formal dress from Stella McCartney

15. Valani

Valani’s plant-based clothing is perfect for warm-weather special occasions like spring weddings, summer soirées, and date nights. The vegan fashion brand uses mindful fabrics like hemp, Tencel, and banana viscose (a silky-feeling fiber made out of discarded banana tree stems). Each piece is made in Valani’s GOTS-certified factory that follows socially and environmentally responsible practices.

Conscious Qualities: WOC-Owned, Earth-Minded Fabrics, Non-Toxic Dyes, Eco Packaging

Size Range: 0-12

Price Range: $$$

Browse Valani

Pink ethical dress from Valani

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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Best of Sustainability In Your Ear: Okhtapus Cofounder Stewart Sarkozy-Banoczy Accelerates Ocean Solutions

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The ocean provides half the oxygen we breathe, absorbs 30% of our carbon emissions, and helps control the planet’s climate. By 2030, it’s expected to support a $3.2 trillion Blue Economy. Yet 70% of proven ocean solutions, such as coastal resilience, coral restoration, and marine pollution cleanup, never move past the pilot stage. These projects often win awards and get media attention, but then stall because funding systems don’t connect working ideas with the cities, ports, and coastal areas that need them. Stewart Sarkozy-Banoczy, co-founder and ocean lead at Okhtapus, wants to change that. Okhtapus, named with the Persian word for the octopus, uses a model that links what Stewart calls “the three hearts” of successful projects: innovators with proven solutions, cities and ports ready to use them, and funders looking for solid projects.
Stewart Sarkozy-Benoczy, Cofounder and Ocean Lead at Okhtapus.org, is our guest on Sustainability In Your Ear.
The first Okhtapus Global Replicator will launch in 2026. It will bring groups of proven innovators to work on important projects in specific places, such as a single port city like Barcelona, where Okhtapus already has strong partnerships, or a group of Caribbean islands facing similar problems. The aim is to have enough successful projects that funders stop asking “where are the deals?” and start saying “we’ve got enough.” The platform focuses on late-stage startups and scale-ups, not early-stage ideas. Stewart calls these the “Goldilocks zone”—solutions that are proven enough to copy but still need funding and partners to grow. By combining several solutions for different locations, Okhtapus can offer investors portfolios that fit their needs and make a real difference in cities, ports, and island nations.
Stewart has spent 20 years working where climate resilience and policy meet. He was part of President Obama’s Hurricane Sandy Rebuilding Task Force, led policy and investments at the Resilient Cities Network, and is now Managing Director of the World Ocean Council. “Ten years from now, if this is done fast enough,” Stewart said, “we should have pushed hard enough on the funders and the system to change it. What we don’t know is whether we’ll get to the solution status fast enough for some of these tipping points.”
To find out more about Okhtapus, visit okhtapus.org.

Editor’s Note: This episode originally aired on December 22, 2025.

The post Best of Sustainability In Your Ear: Okhtapus Cofounder Stewart Sarkozy-Banoczy Accelerates Ocean Solutions appeared first on Earth911.

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Earth911 Inspiration: A Serious Look at Modern Lifestyle

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Today’s quote comes from Pope John Paul II’s message for the celebration of the World Day of Peace, 1990. He wrote, “Modern society will find no solution to the ecological problem unless it takes a serious look at its lifestyle.”

Earth911 inspirations. Post them, share your desire to help people think of the planet first, every day.

Pope John Paul II quote from World Day of Peace message

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Best of Sustainability In Your Ear: Making Billions of Square Feet of Commercial Space Sustainable with CBRE’s Rob Bernard

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The built environment, particularly office buildings other urban facilities, are responsible for 39% of the global energy-related emissions, according to the World Green Building Council. About a third of that impact comes from the initial construction of a building and the other two-thirds is produced over the lifetime of a building by heating, cooling, and providing power to the occupants. Our guest today is leading a key battle to reduce the impact of the built environment. Tune in for a wide-ranging conversation with Rob Bernard, Chief Sustainability Officer at CBRE Group Inc., which manages more than $145 billion of commercial buildings, providing logistics, retail, and corporate office services across more than than 100 countries.

Rob Bernard, Chief Sustainability Officer at the commercial real estate giant CBRE, is our guest on Sustainability In Your Ear.

Rob cut his sustainability teeth at Microsoft, as its Chief Environmental Strategist for 11 years, as the company was developing its world-leading approach and collaborating with other tech giants to lobby for policy and funding to accelerate progress. He discusses CBRE’s Sustainability Solutions & Services for commercial building owners, as well as the accelerating progress for renewables, carbon tracking, and economic, health, and lifestyle benefits of living lightly on the planet. You can learn more about CBRE and its sustainability services at cbre.com

Take a few minutes to learn more about making construction and building operations more sustainable:

Editor’s Note: This podcast originally aired on April 15, 2024.

The post Best of Sustainability In Your Ear: Making Billions of Square Feet of Commercial Space Sustainable with CBRE’s Rob Bernard appeared first on Earth911.

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