Madewell Second Wave Retro High-Waisted Bikini Bottom Also made from 80 percent pre-consumer recycled nylon, this Madewell Second Wave Retro High-Waisted Bikini Bottom ($35, originally $50) features a super-flattering high-back cut. Image Source: madewell.com Madewell Second Wave Retro High-Waisted Bikini Bottom $35 from madewell.com Buy Now