NEW YORK — Talk about tossing out fashion dogma. Swimsuits aren’t just for swimwear companies anymore. From outerwear to eveningwear, designers have taken the plunge and included at least a bikini or maillot in their resort collections. They’re also coming up with some of the sultriest sarongs on the horizon. Randolph Duke, a generator of hot evening looks, thinks that “clothes are sexy again. Add to that the interest in health, sunshine and Brazilian girls — all that makes bathing suits a must-have.” Here, his nylon and Lycra spandex maillot under a silk chiffon sarong. For more, see pages 6 and 7.