How to Sell Fashion Online in the UK (2026): ASOS, NEXT, Amazon UK & Marketplace Seller Guide
Before anything else, this guide needs to correct something, because a great deal of the advice currently sitting on the internet about selling fashion in the UK is out of date. ASOS Marketplace, the boutique platform launched in 2010 where independent labels and vintage sellers ran their own storefronts, has been wound down. ASOS confirmed it would migrate those sellers onto its main site, with the migration completing around April 2025.
If you want to sell on ASOS in 2026, the route is different: ASOS Partner Fulfils, a curated, closed partner marketplace powered by Mirakl, where approved brands fulfil orders placed on the ASOS site and app directly. It is more selective, brand-focused rather than boutique-focused, and its image requirements are entirely different from the old Marketplace's. That correction aside, the UK remains one of the most valuable fashion ecommerce markets in the world — the largest in Europe by online fashion penetration.
FEATURED SNIPPET
How do you sell fashion on ASOS in 2026?
The original ASOS Marketplace has been wound down, with sellers migrated to the ASOS main site around April 2025. In 2026, the route to selling on ASOS is the ASOS Partner Fulfils programme, a curated, closed marketplace powered by Mirakl, where approved brands fulfil orders placed on ASOS directly rather than storing stock in ASOS warehouses. It is invitation- and application-based, with no setup or monthly fee, and commission agreed during onboarding. Image requirements are strict: portrait orientation only, a light grey background close to 240 RGB, recommended dimensions around 2116 x 2700 px with a minimum around 1500 x 1900 px, and 300 dpi. On-model photography is required for clothing. Because on-model imagery is required, AI model photography tools like Studiofy offer UK sellers a route to compliant imagery without a studio production.
Studiofy At a Glance
Why the UK Is a Priority Fashion Market
Europe's most digitally mature fashion market — the UK has among the highest online fashion penetration rates in the world; British shoppers buy clothing online as a default behaviour
English-language, globally connected — for sellers in India, the US, or anywhere anglophone, the UK removes the localisation friction Germany or France impose
A genuinely diverse channel mix — a fashion specialist (ASOS), a high-street retailer turned marketplace (NEXT), a general giant (Amazon UK), a European platform (Zalando UK), and the world's most developed resale ecosystem (Depop, Vinted, eBay)
Social commerce is mature — TikTok Shop UK is one of the most developed globally; short-form video is a primary discovery and conversion channel
The honest counterpoint: UK fashion returns are high, competition is fierce, and post-Brexit VAT, customs, and import obligations add real complexity for non-UK sellers. Factor that in properly before you commit.
ASOS in 2026: The Current Route
ASOS Partner Fulfils is ASOS's partner marketplace, powered by the Mirakl marketplace platform. Under it, approved brands fulfil orders placed on the ASOS website and app directly, shipping to the customer themselves rather than housing stock in ASOS fulfilment centres.
ASOS is a closed marketplace — there is no open self-serve signup. You apply, and must sell fashion products that align with ASOS's predominantly young adult audience
No setup or monthly fees — unlike the old Marketplace's monthly fee, commission is agreed during onboarding — it is negotiated, not published
Mirakl-based integration — integration happens through a Mirakl Connect account or an integrator platform; you can request an account per currency, making ASOS a multi-market route
Content in English, manual approval — submit product content in English; ASOS reviews new partner listings manually, which is exactly why the image specification matters so much
ASOS Image Guidelines (2026)
ASOS's listing approval process is manual for new partners, and non-compliant images delay approval — commonly reported as a two-to-four-week delay for first-time submissions. That is lost revenue, entirely avoidable.
Light grey at roughly 240 RGB is not white. If you cross-post Amazon images — which must be pure white at RGB 255,255,255 — straight to ASOS, they will not comply. Notably, Zalando applies a very similar light-grey standard, so images produced correctly for one can often serve the other. ASOS also enforces catalogue-wide consistency and provides an aesthetic brief that your models, lighting, and backgrounds must match.
The Rest of the UK Marketplace Landscape
NEXT Marketplace — one of the UK's strongest retailer-led marketplaces, with the trust of an established high-street name and a broader, more affluent audience than ASOS
Amazon UK — unmatched reach, but pure white background at RGB 255,255,255, square-leaning, product filling at least 85% of the frame
Zalando UK — part of Zalando's ~25-market European footprint, with the strictest image standards of any European fashion platform
Etsy UK and Not On The High Street — the routes for handmade, vintage, and independent craft-led fashion and jewellery
Depop and Vinted — the UK's resale giants; both are on-model-friendly and reward authentic, well-lit, worn photography over sterile catalogue shots
TikTok Shop UK — one of the world's most developed TikTok Shop markets — short-form video is the discovery engine
What Actually Converts With UK Fashion Buyers
On-model imagery, decisively — ASOS requires it, Zalando requires it, Amazon expects it for apparel, and Depop and Vinted buyers respond to it
Honest fit and sizing information — UK fashion return rates are high and fit is the dominant cause; imagery that truthfully shows how a garment sits is your best return defence
Short-form video — TikTok Shop UK, Instagram Reels, and YouTube Shorts drive an enormous share of UK fashion discovery
British English and terminology — trousers not pants, jumper not sweater, trainers not sneakers; British spellings throughout
How Studiofy Helps UK Fashion Sellers
Photograph your garment cleanly
A flat lay, hanger shot, or product photo works as the input. Steam it, light it evenly, shoot it honestly.
Upload to Studiofy and choose your model and setting
Select a model appearance and styling appropriate to your brand and to the UK audience you are targeting — ASOS's young shopper looks very different from NEXT's.
Generate photorealistic on-model imagery in portrait
Studiofy preserves your garment's real colour, print, and texture and places it on a photorealistic model — the fit-and-drape communication ASOS's guidelines require.
Generate short video ads for TikTok Shop, Reels, and paid social
From the same product image, produce 4-, 6-, and 8-second product videos for one of the world's most developed TikTok Shop markets.
Export per platform and verify
Light grey (~240 RGB), portrait, 300 dpi for ASOS. Pure white, square-leaning for Amazon UK. Check colour accuracy against the physical garment and confirm consistency across your catalogue.
UK Marketplace Comparison
Common Mistakes UK Fashion Sellers Make
Following outdated ASOS Marketplace advice — The boutique model is gone. Do not build a plan around it.
Cross-posting Amazon's pure-white images to ASOS — ASOS wants light grey around 240 RGB. Different platform, different export.
Submitting square or landscape images to ASOS — Portrait only. This alone can cost you weeks in manual review.
Ignoring catalogue-wide consistency — ASOS provides an aesthetic brief and expects your models, lighting, and backgrounds to match across your listings.
Using American English — Trousers, jumpers, trainers, colour, jewellery. It matters more than sellers think.
Skipping video — TikTok Shop UK is one of the world's most developed. Static-only catalogues lose discovery.