Tankini Swimsuits For Women Plus Size Market Report: Sales Volume, Market Share, Leading Brands & Market Trends

MODLILY is the best-performing tankini swimsuits for women plus size brand in July 2026, moving 1,300 units across 2 ASINs for 20.6% of Top 10 volume. Summer Mae follows with 1,300 units (20.6%), ahead of Daci on 1,000 units (15.9%).

Volume is spread across 7 brands, with the top three holding 57.1% between them. No single label controls the shelf, which usually leaves room for a well-differentiated listing to take share without outspending an incumbent. Average selling prices among the leaders run from $39.99 to $43.99, 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: B09V5KFW3B booked 500 units at $38.99, with ▲ 0.0% 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already changed hands — an incumbent gave up its place to make room, so any competitive set drawn up a month ago is now out of date.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.