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More Sustainable Fashion Brand Offers This September 2025

Words: Partnerships Editor

Category: Top Picks

Published: 07 Sep 2025

Every week we publish offers and discounts from highly rated brands that have been assessed by our rigorous ratings system. Using our codes and links may earn us a commission—supporting the work we do. Learn more.

Good On You believes everyone should have access to more sustainable and affordable options when they need to buy something new. That’s why we share exclusive promotional offers from our network of more sustainable fashion brands, which have all been rated “Good” and “Great”. We update these offers every Wednesday to ensure you’re only seeing active promotions—this helps you find the best prices from some of our best-rated brands, and it gives us a means of highlighting and supporting their work, too.

Codes and offers from more sustainable fashion brands

No Nasties

Offers

No Nasties – Shirts For Men

Cool, more sustainable organic cotton airy shirts you will wear everyday. Exclusive 10% off with code NONASTIES10 (Ends: 8 OCT)

Checkout code: NONASTIES10

No Nasties – Cuban

Too hot or too cold when travelling? Soft organic cotton lets air move through, helping to maintain your body’s temperature. Exclusive 10% off with code NONASTIES10 (Ends: 6 OCT)

Checkout code: NONASTIES10

No Nasties – Conscious Co-ords

A compliment-worthy combo – style plus comfort. And nothing is cooler and more comfortable than organic cotton. Compliments guaranteed. Exclusive 10% off with code NONASTIES10 (Ends: 2 OCT)

Checkout code: NONASTIES10

No Nasties – Dresses

More sustainable dresses in 100% organic cotton. And yes, they have pockets. Exclusive 10% off with code NONASTIES10 (Ends: 28 SEP)

Checkout code: NONASTIES10

No Nasties – Bedsheets

These organic bedsheets feel like a hug, a nap, and a spa day rolled into one. Sleep clean. Sleep smug. Exclusive 10% off with code NONASTIES10 (Ends: 26 SEP)

Checkout code: NONASTIES10

No Nasties – Mixology For Him

Crafted from leftover organic cotton, stitched in small batches, finished with corozo buttons. Exclusive 10% off with code NONASTIES10 (Ends: 18 SEP)

Checkout code: NONASTIES10

No Nasties – Bloom

Every day, No Nasties plants trees for every single garment you buy. Organic cotton clothing that heals the planet. Over 239454 trees planted. Exclusive 10% off with code NONASTIES10 (Ends: 16 SEP)

Checkout code: NONASTIES10

Another leader when it comes to responsible fashion, No Nasties makes simple and stylish clothing from Fairtrade organic cotton in India where it is actively working to grow the ethical consumer market.

Find styles in sizes 2XS-3XL.

See the rating.

Shop No Nasties.

Etiko

person wearing blue and white ethical sneakers by Etiko

Offers

Etiko – Site-wide

Take 20% off everyday ethical essentials: sneakers, hoodies, tees and flipflops. Exclusive 20% off with code ETIKO20 (Can’t be combined with other discount code.) (Ends: 16 SEP)

Checkout code: ETIKO20

Etiko is an Australian designer of organic fair trade clothing and shoes. The brand constantly sets the bar for upholding and campaigning the human rights of people working in traditionally exploitative industry supply chains.

Find the clothes in AU sizes 8-20, and the shoes in UK sizes 3-13.

See the rating.

Kuyichi

Offers

Kuyichi – Site-wide (EU)

Discover a wide variety of styles, fits and colours in Kuyichi’s line of jeans and tops made with recycled and organic materials for men and women. Exclusive 15% off with code KUYICHI15 (Only available in the EU.) (Ends: 17 SEP)

Checkout code: KUYICHI15

Established in 2001, Kuyichi is the first organic denim brand. With top-scoring labour and environmental ratings, the brand designs durable yet trendy and modern pieces that never go out of style.

Offered in sizes XS-L.

See the rating.

Shop Kuyichi @ Shop Like You Give a Damn.

eBay

Offers

eBay – Pre-loved clothes, shoes, and accessories (UK)

Find pre-loved fits with trusted sellers. Up to 70% off pre-loved clothes, shoes, and accessories. (Only available in the UK.) (Ends: 18 SEP)

Shop pre-loved fashion.

LANIUS

Someone wearing a pink tailored suit jacket and trousers, and someone wearing a colourful sweatshirt and bottoms by LANIUS.

Offers

LANIUS – Site-wide (EU)

Feminine, more sustainable Knitwear, dresses, blouses, and essentials. GOTS-certified, fair produced. Exclusive 10% off with code GOODLANIUS10 (Only available in the EU. One use per customer. Cannot be combined with other promotions.) (Ends: 21 SEP)

Checkout code: GOODLANIUS10

“Love fashion, think organic, be responsible” are the maxims of LANIUS. The German brand uses lower-impact materials, like GOTS certified cotton. All LANIUS facilities are SA8000 certified and it is a member of the Fair Wear Foundation.

LANIUS’ clothes are available in EU sizes 34-44.

See the rating.

Dorsu

Someone wearing a white collared shirt, a black jumpsuit, and cardigan by Dorsu.

Offers

Dorsu – T-shirts

More sustainably made in Cambodia. Crafted with attention to detail, ensuring they’re not just comfortable, but also stylish and versatile. Exclusive 30% off T-shirts with code DORSUTSHIRT30 (Ends: 22 SEP)

Checkout code: DORSUTSHIRT30

Based in Cambodia, Dorsu creates everyday basics and key signature favourites that form the core of any conscious wardrobe.

You can find the full range in XS-XL.

See the rating.

NIKIN

Offers

NIKIN – Site-wide

More sustainably-made essentials – from t-shirts to accessories. 1 tree planted for every item sold. Exclusive 20% off with code GROWTOMATTER18 (Ends: 23 SEP)

Checkout code: GROWTOMATTER18

If you’re the kind of person who likes to wear their morals, look no further than Swiss brand NIKIN. Not only is a tree planted every time you purchase a NIKIN product, you also get to show your tree pride.

Products are available in sizes XS-2XL.

See the rating.

OhSevenDays

Offers

OhSevenDays – Site-wide

Timeless womenswear that is as thoughtful as it is stylish, crafted with ethical production practices and more sustainably sourced materials. 20% off with code BYEBYESUMMER25 (Ends: 23 SEP)

Checkout code: BYEBYESUMMER25

OhSevenDays was started by Australian-Canadian Megan Mummery to promote slow fashion and the “power of circularity”. Based in Istanbul, the brand reclaims end-of-roll fabrics from the city’s garment factories and creates sharp, everyday womenswear that’s as wearable as it is responsible. Essentially, it makes slow fashion from fast fashion’s leftovers.

OhSevenDays’ garments are available in sizes XS-XL, or in custom sizing.

See the rating.

Shop OhSevenDays.

The Classic T-Shirt Company

Offers

The Classic T-Shirt Company – Site-wide (US)

Luxury essentials crafted in the USA from 100% GOTS-certified organic cotton. Made with ethical local production, fair wages, and zero plastic packaging. Exclusive 15% off with code GOODTCT15 (Only available in the US.) (Ends: 25 SEP)

Checkout code: GOODTCT15

The Classic T-Shirt Company is a US brand that creates premium, responsibly made t-shirts with luxury and integrity. All of its products are made from GOTS certified organic cotton and it doesn’t use any animal-derived materials.

The Classic T-Shirt Company’s range is available in US sizes XS-3XL.

See the rating.

Shop The Classic T-Shirt Company.

Fanfare

Offers

Fanfare Label – Site-wide (US, EU, UK)

Full designer womenswear collection of seasonless, sustainable garments that are far from basic. Exclusive 50% off (Only available in the US, the EU, and the UK.) (Ends: 28 SEP)

Fanfare is a UK-based more sustainable brand that transforms vintage clothes into unique pieces using recycled materials. It promotes slow fashion with its repair services, take-back scheme, and lifetime guarantee.

Find most items in UK sizes 4-18.

See the rating.

Shop Fanfare @ Earthkind.

éclipse

Offers

Eclipse Apparel – Site-wide

All Eclipse sun protective apparel is made with recycled materials. Exclusive 20% off with code Good20 (Ends: 28 SEP)

Checkout code: Good20

éclipse creates climate control UPF 50+ clothing essentials and accessories to help keep the whole family sunsafe. It manufactures locally to reduce its carbon footprint, and its entire product range is vegan-friendly.

Products are stocked in sizes S-XL.

See the rating.

Shop éclipse @ Shop Like You Give a Damn.

SukkhaCitta

Someone in a gorgeous, flowing gold dress by SukkhaCitta.

Offers

SukkhaCitta – Kebaya Vest

A modern interpretation of the Indonesian heritage Kebaya, with a sleeveless take for a more everyday feel that pairs well with your wardrobe. Free embroidered pouch with a purchase of selected products. (First order only.) (Ends: 29 SEP)

SukkhaCitta – Light Beskap

The SukkhaCitta Light Beskap is your daily armor: soft, strong, and deeply rooted. A reimagined classic. Reinterpreted with softer structure for comfort. Free embroidered pouch with a purchase of selected products. (First order only.) (Ends: 29 SEP)

SukkhaCitta – Tilem Kebaya

An iconic reinterpretation of the classic Indonesian Kebaya Kutubaru. Crafted from 2,000 threads of handwoven, naturally dyed eucalyptus fibre Free embroidered pouch with a purchase of selected products. (First order only.) (Ends: 29 SEP)

SukkhaCitta – Pertiwi Kebaya

A modern take of the traditional Indonesian kebaya. A long sleeves kebaya look that hugs your curves. Free embroidered Tumpang Sari Dumpling pouch with a purchase of selected products. (First order only.) (Ends: 29 SEP)

SukkhaCitta is a certified B corp brand from Indonesia creating timeless modern heirlooms leveraging heritage crafts.

Find the range in sizes XS-L.

See the rating.

Shop SukkhaCitta.

ZEROBARRACENTO

Offers

ZEROBARRACENTO – Site-wide

Timeless, zero-waste, gender-neutral outerwear made in Italy from certified materials, focusing on quality, traceability and timeless design. Exclusive 25% off with code 25xGOOD0/100 (Ends: 4 OCT)

Checkout code: 25xGOOD0/100

ZEROBARRACENTO is an Italian brand that creates zero-waste clothes that celebrate the personality of those who wear it.

You can find most pieces in sizes S-L.

See the rating.

Shop ZEROBARRACENTO.

Nui Organics

Someone with children dressed in tops and bottoms by Nui Organics.

Offers

Nui Organics – Kids Merino Silk Base Layers

Soft, breathable kids’ base layers made from merino wool and silk—perfect for sleep, play, or layering. Naturally comfy, all-season wear. 25% off kids merino silk base layers. (Ends: 5 OCT)

Nui Organics – Women’s Merino Silk Base Layers

Luxuriously soft merino wool and silk sets for women. Breathable, temperature-regulating, and perfect for sleep, lounging, or layering year-round. 25% off women’s merino silk base layers. (Ends: 5 OCT)

Nui Organics was founded on a culture of consciousness, community, and intentional design. It creates high-quality, lower-impact Merino wool and organic clothing for families in timeless styles.

Find sizes for children aged 0-12 years, and XS-2XL for adults.

See the rating.

Shop Nui Organics.

SeamsFriendly

Offers

SeamsFriendly – Shirts and T-Shirts for Men

Menswear that fits your body, whether you’re tall, short, or anywhere in between, experience the confidence of made-to-measure attire. Exclusive 15% off with code SF-GY15 (Sale items excluded.) (Ends: 7 OCT)

Checkout code: SF-GY15

SeamsFriendly – Jumpsuits and Rompers

One-pieces made to fit you—no more short sleeves or awkward lengths. Made to measure from breathable fabrics that are gentle on the skin. Exclusive 15% off with code SF-GY15 (Sale items excluded.) (Ends: 7 OCT)

Checkout code: SF-GY15

SeamsFriendly – Reversibles and Convertibles

Double your options with one garment. SeamsFriendly’s reversible and convertible pieces offer multiple looks in one item. Exclusive 15% off with code SF-GY15 (Sale items excluded.) (Ends: 7 OCT)

Checkout code: SF-GY15

SeamsFriendly – Customisable Clothing For Women

Customisable clothing that’s handmade by skilled artisans according to your body measurements and style preferences. Exclusive 15% off with code SF-GY15 (Sale items excluded.) (Ends: 7 OCT)

Checkout code: SF-GY15

SeamsFriendly – Site-wide

Handcrafted tailor-made clothing for women, men and kids of all body types, sizes and heights. Exclusive 15% off with code SF-GY15 (Sale items excluded.) (Ends: 5 OCT)

Checkout code: SF-GY15

SeamsFriendly creates beautiful tailored pieces for all body types. It focuses on function and utility in its designs and uses lower-impact materials like organic cotton and linen. What’s more, shoppers can customise the brand’s designs to their exact preferences—change the neck style, depth, sleeve length, garment length, fabric, and more on anything in its array of clothes.

The brand’s product sizing is customisable (bust size range 26″-70″, waist size range 19″-63″, including petite, regular, and tall heights) to ensure you always find the perfect fit, and there’s a kids range (bust: 18″-28″, waist: 19″-26″) available too.

See the rating.

Shop SeamsFriendly.

Retykle

Offers

Retykle – Site-wide (US, UK)

Free US shipping on orders over $150. Free UK shipping on orders over £100. (Ends: 8 OCT)

Shop pre-loved designer kidswear.

All The Wild Roses

Offers

All The Wild Roses – Site-wide

More sustainable brand for women, offerings cotton, linen and vintage inspired print dresses, blouses and shirts. 50% off site-wide. (Ends: 30 NOV)

All The Wild Roses offers free-spirited fashion for the dreamers and change-makers. This Australian brand uses up to 50% deadstock fabric to create high quality and long-lasting products.

Find most items in sizes XS-2XL.

See the rating.

Shop All The Wild Roses.

Editor's note

Feature image via Unsplash, other images via brands mentioned. Good On You publishes the world’s most comprehensive ratings of fashion and beauty brands’ impact on people, the planet, and animals. Use our directory to search thousands of rated brands.

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