encouraging advice: "Any length in any form goes." TOPS Skin. Cut-away and off-the-shoulder tops are popular. Tank tops. Halter tops. Corporation Cortina has 100 percent cotton sweaters and sleeveless tops also. Hersh's has some Art Deco inspired sweaters. PANTS Wider pants are in style. Pants are softer and wider with lightweight fabrics. SWIM SUITS Roslyn Rock of Roslyn's Intimate Apparel has a complete line of Gottex bathing suits. "Summer 1987 has styles that range from all-revealing to mostly concealing," notes Roslyn. Some of the stunning Gottex suits have playful polka dots on red or black. The jungle motifs are bright and bold, and the snakeskin prints shimmer with metallics. Begadim carries an exclusive line of Gideon Oberson bathing suits. These suits are often seen on the "Dynasty" television program. One grouping has sequins. Other styles have bold colors on a black background. Turquoise and peach are shown also. According to owner Lea Beurer, what sets his swimwear apart from the others is the use of Italian lyrca. "It (bathing suit) doesn't sag when you get out of the water. It's extremely flattering. He exposes the best part of anyone." Yellow cotton polka dot halter dress, $98, and thong sandals, by Liz Claiborne. EVENING CLOTHES The fabrics of chiffon, organza and lace teamed with ruffles and frills make exquisite evening gowns. At Naomi's, two stunning navy gowns use beads and rhinestones combined with netting and pouf for a new statement. "Navy is tres chic," states owner Naomi Lippa. Also at Naomi's were many strapless evening dresses and some with the stylish bubble bottom in red taffeta. Another March 1987 43