11 Sustainable Cocktail And Wedding Guest Dresses (2025)
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We’ve reviewed dozens of formal dresses from sustainable brands — these are our top picks for comfort, style, and fit for your next cocktail party or black tie event.
We all know how the onslaught of social events can make it all too easy for fast-fashion dresses to pile up in our closets, getting only a few uses a year. One solution is to rent a dress, which is a great option when we have a single black tie event in a season of beach receptions, and we know we won’t get a chance to recycle the look. When we do buy, we can opt for dresses made with fair trade practices to ensure all employees are paid living wages while working under safe conditions, using materials that won’t harm the planet.
Our criteria:
We’ve rounded up our favorite sustainable cocktail and wedding guest dresses that meet the following criteria:
- ETHICAL PRACTICES | These formal dresses are made by sustainable brands that adhere to ethical and responsible labor practices, ensuring their employees receive fair wages and have safe working environments. We’ve also included dress brands that give back to their communities and prioritize size inclusivity in their offerings.
- ECO-FRIENDLY/SUSTAINABLE | Each dress collection is made by a brand that practices sustainability throughout its manufacturing process, including using all natural and organic materials, low-impact processes, and recycled/upcycled materials in its dresses where possible.
- DESIGN | From flowy sundresses to chic and formfitting cocktail attire, we’ve compiled a roundup of dress designs for every possible occasion and need.
These stunning dresses are perfect for any formal event or occasion — and they’re made ethically. Just don’t forget ethical jewelry to complete your look!
1. Reformation
Based In | Culver City, CA
Best For | Guest dresses for summer weddings
Price | $98 – $940
Sizes | XSP – 3X
Reformation puts people and planet at the center of everything they do: ¾ of their team are women or underrepresented populations; they also employ sustainable practices through and through, from the supply chain process through supporting employee use of public transportation. We love their detailed filter options, letting you sort though their extensive collection with options like fabric, pattern, sleeve length, and even sustainability! Most of their sustainable dresses are made with TENCEL, viscose, or linen, creating that lightweight yet flattering look, no matter where you are. Pair these with wedge sandals and a small clutch, and you’re all set for that summer wedding.
2. Sézane
Based In | Paris, France
Best For | Glam dresses
Price | $150 – $345
Sizes | XXS – XXXL
Sézane offers glam dresses perfect for holiday parties or weddings, seamlessly blending elegance with versatility. Each piece is thoughtfully crafted from the finest materials, focusing on responsible production and impeccable design. Guided by a commitment to sustainability, Sézane avoids overproduction, unsold stock, and sales, releasing timeless designs and reintroducing archives twice a year to ensure nothing goes to waste. Their dedication extends to philanthropy through the DEMAIN program, which has raised over €7 million to support education, health, and culture globally.
3. Rent The Runway
Based In | New York, NY
Best For | Dresses for galas and fundraisers
Price | $25 – $1,590; subscriptions available with plans starting at $89
Sizes | 0 – 22
A nontraditional (yet feasible!) option for fair trade formal wear is Rent The Runway. Customers can rent a dress of their choice, casual or formal, for a set amount of time and return it after that special occasion, without the heavy price tag. When the average woman throws out 82 pounds of clothing a year, it’s easy to see how it can all add up to a more polluted world. Instead, RTR makes it easy with thousands of affordable options that suit any event. This is the solution for those of that need “special occasion” dresses to show off several times a year for fundraisers and galas, considering many of their brands are high-end designers.
Customer Review | “Packed this for recent trip and was very comfortable, nice fit and received lots of compliments.” – Kathleen (Read all reviews.)
4. Quince
Based In | San Francisco, CA
Best For | Casual reception dresses
Price | $40 – $150
Sizes | XS – XL
San Francisco-based Quince is known for its affordable and sustainable classic clothes, perfect for timeless capsules. The company keeps prices low by shipping directly from their factories, cutting out costly middlemen and excessive packaging to boot. Slide into one of their washable silk slip dresses or try a fit & flare number made from TENCEL Lyocell, a fiber extracted from sustainably grown wood using a closed-loop system that minimizes the environmental impact of production.
Customer Review | “This dress is so flattering on! The fabric is so soft and silky! Very impressed.” – Lindsey E. (Read all reviews.)
5. Amour Vert
Based In | Los Angeles, CA
Best For | Comfortable dresses
Price | $95 – $275
Sizes | XS – XL
Amour Vert clothing embodies a commitment to sustainability, combining artisan craftsmanship with eco-conscious materials and responsible supply chains. Each cocktail dress design prioritizes low-impact fabrics, mindful packaging, and a dedication to circularity, ensuring style with purpose. From certified fibers to compostable packaging, every choice is made with care. Plus, the brand gives back through their Tees for Trees initiative!
Customer Review | “I love the fabric and color. It is a true wrap dress, so I wear a slip underneath. Nursing mama friendly!” – Kara K. (Read all reviews.)
6. Christy Dawn
Based In | Los Angeles, CA
Best For | Bridal or baby shower dresses
Price | $119 – $498
Sizes | PL – 3X
Christy Dawn knows that everything we do impacts the planet and its people: “No matter how a piece of clothing looks, it cannot be considered beautiful if, in producing it, the environment is destroyed or people are exploited.” That’s why this stunning brand uses only deadstock (the residual fabrics leftover from other fashion houses) that are sewn together by seamstresses in Los Angeles, who are paid fair trade wages and given benefits. The outcome? Gorgeous, feminine, and flirty dresses with tulip sleeves, floral designs, and flattering fits. With sizing that includes petites and up to 3X, they’re an inclusive and mindful brand that has formal wear for bridal showers, family celebrations, or a garden gala.
Customer Review | “Like all the other dresses I have purchased from Christy Dawn, I’m absolutely in love! So comfortable and flattering 🙂“ – Frances E. (Read all reviews.)
7. Xirena
Based In | Los Angeles, CA
Best For | Breathable lightweight dresses
Price | $180 – $525
Sizes | XS – XL
LA-based brand Xirena mindfully crafts laidback formal wear that looks chic and effortless. Many styles are both designed and made right here in the US, and each style is well thought out to reflect timeless California style. We love how you can dress up or dress down these styles so you can get multiple uses out of them for a variety of occasions! View their lookbook for inspiration on how to style your Xirena piece.
8. EILEEN FISHER
Based In | New York, NY
Best For | Dresses for casual weddings and gathering
Price | $298 – $398
Sizes | XXS – 3X
EILEEN FISHER, a longtime pioneer in human rights and sustainability, has put the well-being of the planet and its people at the core of their business model. So much so that their employees are all fair trade, nearly all of their materials and fabrics are sustainable, and they donate to girls’ and women’s empowerment initiatives regularly. Using TENCEL, organic cotton, and viscose, their dresses are perfect for that coworker’s engagement party or an extended relative’s birthday. What we love most about EF’s range is they work for any season — pair with a boot or leggings in the fall, or slip on some sandals and you’re all set.
Customer Review | “Love this dress! Comfortable, beautiful classic green and soft velvet. Great for the holiday season (and other times). Can be casually worn or dressed up.” – Patricia (Read all reviews.)
9. Stella McCartney
Based In | London, UK + New York, NY
Best For | Dresses for cold weather
Price | $575 – $7,300
Sizes | XXS – L
Stella McCartney‘s mission is to operate as a modern and responsible business, and for them, that means having fair trade and sustainable practices. Every member of their supply chain earns a livable wage and has safe working conditions, from designers in New York to garment workers in Hungary and India. Plus, they give back to a number of causes each year, ranging from Oceana to the Hello Beautiful Foundation, incorporating charity regularly into their business model. With luxurious materials like soft velvet and sustainable viscose, their form-fitting dresses are the perfect option for an evening winter wedding, which are sure to keep you warm while still flattering your silhouette. From social to environmental responsibility, Stella McCartney does it all.
10. Loud Bodies
Based In | Cluj Napoca, Romania
Best For | Free custom tailoring
Price | $185 – $640
Sizes | 2XS – 10XL
Founded on the belief that style shouldn’t be dictated by size, Loud Bodies creates clothes designed to make everybody feel and look beautiful. The brand offers ready-to-wear sizes ranging from XXS – 10XL, but also offers custom, free tailoring for all body types that might not fall within the range. (Extra petite? Longer torso? Need to accommodate a wheelchair? They got you!) Most pieces are made-to-order with sustainable materials, limiting overstock waste and making sure their customers get exactly what they’re looking for to look and feel their best for every occasion.
Customer Review | “This dress is pure magic. I love how the ruched elastic back keeps it comfortable without sacrificing style, and the V neckline is so chic. The angel sleeves add such an elegant touch—they make me feel like I’m floating when I wear it. The fabric is lightweight yet luxurious, and the bias-cut skirt moves beautifully. I wore it to a formal dinner, and I got so many compliments. It’s hard to find a dress that looks this good and still has practical details like pockets. This one checks all the boxes!” – Lila S. (Read all reviews.)
11. Boden
Based In | New York, NY
Best For | Dresses for destination weddings
Price | $80 – $320
Sizes | 0T – 22
A longstanding member of the Ethical Trading Initiative, Boden is also committed to using more eco-friendly fabrics, pledging for all of their clothing to be made from sustainable materials by 2025. Since traditional viscose isn’t great for the planet, the company has been turning to LENZING™ ECOVERO™ fibers that are derived from sustainable wood and pulp, coming from certified and controlled sources following the stringent guidelines of the Lenzing Wood and Pulp Policy. As you dance the night away in one of their bright, unique dresses, you can feel as good as you look about how it was made.
Customer Review | “Beautiful dress. Fabric feels soft and expensive” – Anonymous (Read all reviews.)
Featured image from Reformation
