Old Navy High-Waisted Secret-Slim Plus-Size Swim Bottoms Adding these Old Navy High-Waisted Secret-Slim Plus-Size Swim Bottoms ($30-$32, originally $32) to a longline top makes a perfect coordinating — or mix-and-match — pair. Image Source: oldnavy.gap.com Old Navy High-Waisted Secret-Slim Plus-Size Swim Bottoms $30 from oldnavy.gap.com Buy Now