B Swim L764-PROW Cinchy Party Pant B Swim. $64.00. Designed for versatility, these party pants are made of swim fabric, which makes them perfect for paddle boarding, volleyball, or a fashion statement. nylon. Features a smooth fit waistline, shirring at ankles and our "Do It Yourself" cinch back shirring like our favorite 'Cheeky Cupcake' bottom. Get noticed in these printed stretch leggings. You won't want to take them off!