Remember “Saturday Night Fever” and the wrap-skirt-and-leotard craze it started? The new resort wear has something in common with that look. Fabrics and styling are more sophisticated, closer to ready-to-wear, but like the old look, it begins with a basic leotard. Pull on a cotton-and-spandex bodysuit, wrap a sarong-like skirt over it, and consider yourself dressed for a weekend in Palm Springs. The bodysuit, $29, and mock wrap skirt, $44, both by Bonnie August, are available at The Broadway.