Connected is not the same as profitable: the post-launch trap of fashion marketplaces

The starting line: why fashion plays by different rules

Every brand selling on marketplaces wants the same thing: more profit on more channels. A working connection is what gets you there, and any provider is expected to deliver one. But as our network data shows, the connection is not where the result is decided. The question for brands is no longer whether to connect, but what it takes to keep what they sell. In this article, we look at where margin is lost between gross sales and profit, and how fashion and lifestyle brands can turn marketplace growth into profit they can plan with.

The stakes are high. Fashion e-commerce is expected to grow from around $1.05 trillion in 2025 to $1.17 trillion in 2026 and $1.84 trillion by 2030 (Research and Markets, 2026). But fashion plays by different rules than other categories. Stock moves with the season, fulfilment runs through specialised logistics and returns decide whether an order made money or lost it. Clothing and shoes are the most returned online purchases (Statista, 2025), and the EHI Retail Institute shows how wide the gap is: 67.5% of fashion online retailers report return rates above 20%, while 94.5% of electronics retailers stay at 10% or below (EHI, 2025).

Each marketplace adds its own rules on top. Every marketplace ranks products differently. On Amazon, sponsored ads do a lot of the work. On fashion-first channels like Zalando or ABOUT YOU, you win with rich product details and clean taxonomy mapping. Sizes, fits and colours have to be mapped for each channel, and a mapping that works on one doesn’t automatically work on the next.

None of this shows up when an integration goes live. It shows up later, in your GMV.

1. The most common hurdle: Returns

In the US, retailers estimated that 16.9% of their annual sales were returned in 2024, with online sales at around 20%, adding up to $890 billion of returned goods (NRF and Happy Returns, 2024). Fashion sits well above that. The EHI Retail Institute found that fashion and accessories have the highest e-commerce return rates in the DACH region, averaging between 26% and 50% and reaching up to 75% in individual cases (EHI, 2023). One in four fashion retailers in Germany struggles with return rates of 36% to 50%, and 12.2% see an even higher rate (EHI, 2025).

Returns aren’t edge cases in fashion e-commerce. They’re predictable, recurring events that need operational capacity, financial tracking and customer communication. The customer starts a return, operations process it, finance handles the refund and the payment is reversed or adjusted. Every stage can add cost. Over half of the retailers in the EHI survey put the cost per returned item at up to €10 (EHI, 2025). On marketplaces it gets harder, because return policies are built to be frictionless for shoppers, which passes the logistics burden back to the brand.

The picture also changes from market to market. Based on our proprietary network data, the DACH markets are all above 50%, the Netherlands and the Nordics (Denmark, Finland, Sweden) sit between 38% and 44%, and the southern markets (Italy, Spain, France) perform much better with return rates under 30%.

Without a benchmark, it’s impossible to tell whether you’re ahead of the game or falling behind in a market. Returns also aren’t spread evenly across the range. They swing with the fit, colour and size of each item, so weekly or monthly reporting is too slow. Brands have to steer daily at SKU level to curb loss-making items straight away.

2. Seasons, demand peaks and price pressure

Fashion lives on seasonal launches and fast-moving goods, and the window to sell at full price is short. Demand also bunches up around events: Cyber Week alone brought about 7% of annual GMV and about 22% of Q4 GMV in eight days across the Tradebyte network (25 November to 2 December 2025).

What doesn’t sell in season becomes a problem. When brands can’t rebalance stock late in the season, they get backed into clearance campaigns to free up warehouse space for the next intake. Those markdowns eat into the margin the inventory was meant to earn (BOF, 2025). Discounting is already creeping up: in the first half of 2024, the share of discounted fashion items in the US rose by 5 percentage points year on year, and Nike said markdowns touched around 44% of its assortment in 2024, up from 19% in 2022 (BOF, 2025).

Pricing adds pressure from another side. Brands have to protect their identity from price wars on marketplaces, and the rules differ by platform. On Amazon, the retailer with the best mix of price and delivery time usually wins the Buy Box, so brands often cut prices temporarily to secure it. Deal-driven platforms train shoppers to wait for flash sales and promo events, and discount calendars push brands to follow. Both pull prices down, and both are hard to manage by hand.

The right pricing strategy is therefore decisive, and it has to be adapted to each marketplace. Insights from ECD Munich 2026 show how different the channels are: low-priced products tend to struggle to generate sales on ABOUT YOU and Zalando, while they perform well on Amazon.

3. Stock in silos

Logistics is the biggest hurdle for brands selling on marketplaces, something we heard at many conversations we had with our brands. Fashion makes it harder in three ways.

Trends move fast: trending styles can swing in search volume by up to 300% within 12 months, which makes demand hard to predict (BOF, 2025). Shoppers buy across more channels, so brands need sizes and colours available at more touchpoints, which is difficult without a single stock pool (BOF, 2025). And expectations are high: short delivery times and easy returns are now the norm, which is why marketplaces offer their own fulfilment networks, such as Zalando’s ZEOS and ZFS.

Then comes the trap. A tool that only syncs feeds doesn’t manage physical stock. If a brand splits its stock across ten marketplaces, it can sell out artificially on platform A while goods sit unsold on platform B. Fixed channel splits create stockouts on one marketplace and dead stock on another, and the dead stock ends up in the markdowns described above.

We looked at how to balance this in our post on dropshipping and marketplace fulfilment.

4. Platform rules that punish slow sync

Marketplaces protect the customer experience with strict service level agreements for their partners. One of the key KPIs is the cancellation rate. When stock isn’t there at the moment an order lands, the order is cancelled and the brand pays for it in visibility.

That’s because marketplace algorithms look at far more than keywords. They track operational performance in the back end, and consistent availability is the baseline for organic visibility. A listing that doesn’t match a platform’s ranking criteria risks being pushed down (Marketing Gazette, 2025). Platforms watch customer experience signals in real time, so what happens in your warehouse shows up in your search ranking. Ranking drops usually trace back to inconsistent stock availability, shipment delays and fragmented data. Broken size runs add to it: a jacket with only XS and XXL left is a weak listing, and marketplaces tend to rank weak listings lower.

Slow stock sync makes all of this worse. A product sells out overnight, the update reaches another channel hours later and the same item gets sold twice. Overselling leads to cancellations, ranking loss and, with repeat offences, penalties or even account blocks under platform SLAs. Constantly uploading, removing or deactivating listings for quick price corrections doesn’t help either, and algorithms penalise it too.

Operational reliability is a visibility lever, and can make or break the performance. Consistent availability and real-time stock sync protect your seller score and, with it, the rankings you work hard to earn.

5. Ads judged on gross sales

Marketplaces have turned into ad platforms. Organic visibility on Zalando, ABOUT YOU or Amazon is shrinking, and brands pay for sponsored search and onsite placements just to get seen. It’s also a loop: algorithms reward high conversion velocity, so when ad spend stops, sales volume dips and organic visibility is pushed down even further.

The catch is how it’s measured. Ad reporting often counts gross orders, not what customers keep. Picture a shopper who orders two sizes and sends both back. The ad fee is still charged, the brand pays reverse logistics and processing on top, and ends up with a negative return on a sale that never happened.

What pays off also differs by channel, so a single ad strategy won’t fit them all.

“As long as you have a detailed understanding of your contribution margin and its drivers, marketplace can be a very profitable sales channel.” – Dr. Felix Kreyer, CCO at Breuninger