Q: What kind of blouse would dress up my black wool crepe suit? I'd like to wear the suit out to elegant restaurants, but the printed silk crepe de Chine blouse that came with it is too tailored.--K.T. A: How about a satin T-shirt? The fabric establishes it as dressy, and the style establishes you as a fashion savant. T-shirts made of satiny silk Charmeuse are available for $35, plus postage and handling, in the current catalogue published by Royal Silk, Royal Silk Plaza, 45 E. Madison Ave., Clifton, N.J. 07011. They come in white, light pink and black in sizes petite (4), small (6), medium (8-10), large (12-14) and extra-large (16-18). If you choose white, stuff a black lace hanky in the pocket; if you choose black, use a white hanky. On the other hand, if you choose pink, wear a red hanky. Q: Where can a woman with scarring over her back and chest find a suitable swim suit?--F.A. A: Although it was created by Ruth Handler for mastectomy patients, the swim set illustrated here will solve your problem with style. The cotton / Lycra-mesh cover-up with dolman sleeves comes in white, pastel pink and powder blue, for $56. The matching suit, $78, has a cotton-mesh blouson top and cotton / Lycra rib-knit bottom, joined by a seashell buckle. Sizes 10-16. To order, write to Nearly Me, 2245 Pontius Ave., Los Angeles 90064.