THE LON GaTHE SHORT Continued from preceding page Now for the bad news. In fashion physics, what goes up must come down and long is on the scene. If these first harbingers of a change in hemlines sell well, 'women can expect to see even more long skirts this fall. Most designers took a stab at the longer length but the one who managed it best is Calvin Klein. Fashion pundits loved his flowing skirts: they swirl to mid-calf, and are side-slit or front-buttoned to reveal lots of tanned leg. Ralph Lauren also did long, but his version is the com- plete opposite of Klein's. Lauren shows midi-length skirts in skintight knit fabrics. There are other options, all in- tended to make long skirts look non- threatening and user-friendly. Long slim skirts button up the front or up the back. Long full skirts button over shorts. Asymmetrical skirts slant from long to short. Some designers even did the same outfit in both short and long lengths, and let customers make the ultimate decision. Here is a sampling of what Detroit retailers think regarding what length will prevail in the fall. It's not an issue at Adaria in Birm- ingham. "My customers will be wear- ing short," says owner Anne Dinon. At Don Thomas Sporthaus in the Bloomfield Plaza, buyers can choose between long and short styles. "We are showing a variety of styles,' says Lynne Bay, buyer at Don Thomas Sporthaus. Ms. Bay mentions the long flowing skirts as well as the walking shorts. She says that some spring and summer fashions are still above the knee. "There's no one length." According to Sherri Joseff, buyer for Sherri's in the Orchard Mall, it depends on the occasion whether a customer wears a short or long dress. "Some like the short, kicky look, while we are doing well with long evening MASCULINE/FEMININE MIX: A coatdress is in pinstriped fabric and peekaboo lace. The outfit is further softened by the accessories chosen for it - flower- trimmed tulle fedora and multi-strand pearl necklace. PHOTO FROM DONNA KARAN.