What Sizes Actually Sell for Women's Sportswear?
TL;DR
45M+ units of data show women's sportswear peaks at Medium (tops) and Small (bottoms). Brands should plan around four distinct size curves to cut overproduction.
Across more than 45 million women's tops and bottoms sold online in 2025, a consistent size curve emerges—one that behaves very differently from the men's market and gives brands a clear roadmap for smarter buying.
Using aggregated sales from Lululemon, Alo Yoga, Vuori, Under Armour, Gymshark and LSKD, the data shows a tightly centred distribution. In women's tops, Medium leads with more than 32% of total sales, followed closely by Small at nearly 29%. Together they account for over 60% of demand.
Women's bottoms show a similar but slightly shifted curve. Small is the top-selling size at 33%, with Medium close behind at 28%. XS contributes 16%, while L sits at 13% and XL at just 4%.
The clearest takeaway: men's and women's size curves must be treated differently. The data strongly supports working with four core curves—men's tops, men's bottoms, women's tops, and women's bottoms—simplifying buying, improving accuracy, and reducing the costly overproduction that most new brands struggle with.
