BY CARLA JEAN SCHWARTZ SLEEK LEAN pring fashion this year takes a sleek and lean approach. The trend is body-conscious dres- sing with clothes gently draping and wrapping the body in a soft feminine style. Whether it's knit dressing for women, Italian sweaters for men, or tank tops for children, the body is well defined. The overall look is tapered, polished, and refined reflecting the healthy lifestyle of the '80s. THE BODY: AN OVERALL IMAGE: Retailers and fashion consultants across the country reiterate the body-conscious concept. "The stamp of the 1986 for spring and summer is close to the body," says Gretchen Snow, director of events for Hudson's. She explains the trend as a crisp, clean look. One staple in achieving the new body-conscious look is the body-suit. Designer Donna Karan reintroduced the bodysuit last fall worn underneath skirts and 36 Jewish News pants. The fit is comfortable clothes no longer ride up, and the look is chic. Esther and Estelle's, a boutique in West Bloomfield, has a three-piece cotton, rayon outfit in white or canary yellow, which includes a bodysuit. The mock turtleneck, sleeveless body suit is worn underneath a wrapped skirt that ties. The long, cardigan sweater also ties. This outfit, and other bodysuit combinations, emphasize the body. The premier showing of the Calvin Klein collection by Saks Fifth Avenue, previewed by the Metropolitan Detroit Chapter of Hadassah, included simple and slender clothes. Nothing was tight, but everything followed the natural silhouette. Models sported collarless jackets to the hip with long skirts. The skirts were refreshing with slits in front or on the side. The skirts were refreshing with slits in front or on the side. Brass buttons adorned some jackets and on the shoulder of turleneck tops. The long, linear trend is also