Plus Size Underwear Market Report: Sales Volume, Market Share, Leading Brands & Market Trends

Hanes is the best-performing plus size underwear brand in July 2026, moving 8,000 units across 3 ASINs for 25.8% of Top 10 volume. Sth Big follows with 8,000 units (25.8%), ahead of SHARICCA on 4,000 units (12.9%).

With 7 brands splitting the Top 10 and 64.5% of volume sitting with three of them, this is a concentrated shelf — the leaders hold multiple listings or one very high-velocity ASIN, so a new entrant competes against established review moats rather than an open field. Average selling prices among the leaders run from $12.49 to $19.99, which frames the price band a competing listing has to justify.

Based on July 2026 data, this shortlist surfaces the two kinds of ASIN worth keeping an eye on — the ones that just broke into the Top 10, and the ones growing fastest month over month. Specifically, 3 ASINs forced its way in: B08679XH5S booked 2K units at $17.99, with ▲ 100.0% MoM change.

The two signals carry different weight. A fresh entrant means share has already changed hands — an incumbent gave up its place to make room, so any competitive set drawn up a month ago is now out of date. A steep growth rate works as the earlier warning: it marks demand that is still compounding, usually a month or two before the ranking catches up to it.