Bikini briefs by River Island, Did someone say pool party?, Mid rise, Striped design, Silver-tone bar detail, High-cut leg. River Island takes you from the party to the after party with its fashion-forward styles. Look out for its standout party dresses, feminine details, statement jackets and cool denim including skinny-cut jeans and cute denim shorts, which sit alongside its directional footwear and swimwear ranges.