Fashion and accessories is consistently one of the three best-selling categories in Brazilian e-commerce — and also the most brutally contested. In recent years, Shein and Shopee have rewritten the rules: they redefined the price the customer expects to pay, accelerated the pace of launches, and pushed domestic retail into a race over assortment and speed. Monitoring the competition in fashion is, for that reason, different from monitoring any other vertical — the signals that matter are different ones.
This guide shows what to watch in fashion competitors, why each signal carries weight in this specific sector, and how to turn that into a decision. All anchored in real public data from the Brazilian market.
US$ 3,5 bi
is how much Shein sold in Brazil in 2025 — the measure of how international fast fashion has reshaped online fashion competition.
Reuters / ExpoEcomm, 2025
The online fashion battlefield
Before deciding what to monitor, you need to see the board. Brazilians today buy fashion mostly inside marketplaces — and the leadership of those marketplaces redefines the storefront your customer sees every day.
Marketplace use by Brazilian consumers (% who buy on the platform)
Fonte: Varejo S.A. / CNDL, 2025
The pressure from the international giants is the backdrop to everything. Shein itself, after admitting that scaling local production “didn’t work out”, pivoted to a model of marketplace with Brazilian sellers — which changes who your direct competitor is overnight. For the domestic store, that makes monitoring price and assortment inside the marketplaces not a luxury, but survival.
R$ 258 bn
projected revenue for Brazilian e-commerce in 2026
ABComm
Top 3
rank of fashion and accessories among the best-selling categories
ABComm, 2025
30–40%
typical return rate in fashion (peaks in dresses and jeans)
ExpoEcomm / market
52%
of fashion returns are caused by the wrong size
Market estimates
What to monitor in fashion (and that doesn’t matter in other verticals)
In an electronics e-commerce, price and availability solve almost everything. In fashion, there is an entire layer of signals tied to desire, pace and fit that decide the sale. These are the ones you should track in competitors:
| Competitive signal | Why it matters in fashion | Where to watch |
|---|---|---|
| Frequency and size of drops | Sets the pace of newness and the perception of assortment | Instagram feed and stories, the site’s “new arrivals” tab |
| Size grid and stockouts | A sold-out size is a lost sale — and a signal of real demand | Size selector on the competitor’s product page |
| Exchange and return policy | Becomes a conversion argument in a vertical with 30%+ returns | Returns page, checkout and FAQ |
| Markdowns and collection clearance | Indicate turnover, end of season and inventory pressure | Site outlet/sale, price tags |
| Collabs and influencers | Anticipate campaigns and demand peaks | Mentions, partnerships and sponsored posts |
| Fast fashion anchor price | Shein and Shopee redefine the range the customer expects to pay | Shein/Shopee apps and the marketplaces |
Fonte: Batedor framework for monitoring fashion competitors.
Returns: the KPI that decides margin in fashion
No vertical feels returns like fashion. While the general e-commerce average sits around a lower range, in fashion the rate runs between 30% and 40%, with peaks in dresses, jeans and women’s footwear. And more than half of that volume has a single cause: wrong size.
That’s why watching how a competitor handles exchanges and returns — deadline, reverse shipping cost, ease of a free first exchange, size chart — says more about their competitiveness than many storefront prices. A generous exchange policy converts better; an accurate size chart reduces returns. Whoever monitors this finds positioning gaps that price alone won’t reveal.
The fashion calendar is your monitoring clock
Fashion is the most seasonal vertical in retail: seasons, collections and commemorative dates overlap in a dense calendar. Knowing when a competitor tends to launch, clear out and ramp up media is half the intelligence work.
The competitive calendar of online fashion (Brazil)
Jan–Feb
Summer clearance
Summer collection clearance and the arrival of mid-season
Mar–Apr
Autumn-winter
Winter launches; build-up to Mother’s Day
May
Mother’s Day
One of the biggest fashion retail peaks of the year
Jun–Jul
Winter / June festivals
Peak in knitwear and mid-season clearance
Aug–Sep
Spring / Father’s Day
Collection transition and spring arrivals
Oct–Nov
Summer + Black Friday
Biggest peak of the year; summer collection launch
Dec
Christmas / high season
Gifts on top of the summer peak
Fonte: Overview of Brazilian fashion retail
Referências e leitura complementar
- CNDL / Varejo S.A. (2025). Shopee e Shein dominam o carrinho do brasileiro e desafiam o varejo nacional. Varejo S.A. link .
- ExpoEcomm (2025). Shein admite que a fabricação no Brasil “não deu certo”: o que isso revela sobre o futuro da moda. ExpoEcomm link .
- ExpoEcomm (2025). Devoluções no e-commerce podem custar até 30% acima do valor reembolsado. ExpoEcomm link .
- Carta Capital (2025). Logística reversa: e-commerce, devoluções e receita. Carta Capital link .
- Times Brasil / CNBC (2025). E-commerce no Brasil passa de R$ 200 bilhões e vira mainstream. Times Brasil link .
- Veloce.Tech (2026). Crescimento de 35% consolida moda como destaque do e-commerce em 2025. Veloce.Tech link .
