For that least desirable shopping excursion of the year--buying the summer swimsuit--head straight to Great Shapes, a small chain which has a few other branches on Long Island. For some, a sign temporarily displayed on the outside window said it all: 'We have Juicy.' But the 5,200-square-foot store, done up in French Riviera style, actually carries 80 brands of swimwear up to size 24: Ralph Lauren, Burberry, Tommy Hilfiger, Lisa Curran, Roxanne, La Perla, Tommy Bahama, D&G, Calvin Klein, and more. Select an ensemble, or choose from the impressive selection of separates. After browsing tankinis, scout out the lavish lingerie, with red-hot lines like Cosabella (a favorite of newlywed Jessica Simpson), Bali, Wacoal, Chantelle, Goddess, Hanky Panky, La Perla, Nick and Nora, and Prima Donna.