Marni Bumsted was struggling to keep the fabric between two strategically placed buttons on her stretchy cardigan to stay shut over a bra. When her friend Jennifer Kouba saw her dilemma, she grabbed the double-stick tape she uses in her job as a Los Angeles set stylist and closed the potentially embarrassing opening.Bumsted was struck at that moment. "That was so brilliant," she said. "I was pondering, 'Why didn't I know about this?' Instantly, I thought that it would be a cool product to sell." She thought about it for three years before teaming with a friend she met through their kids' gymnastics, Jane Dailey. Together they created Hollywood Fashion Tape --3- by 1½-inch strips of double-stick, clear medical tape that is hypoallergenic and safe for fabric, packaged in girly pink. A few strips can hold up a strapless dress, pin up a hem, close up wrap dresses and, of course, seal a gapping blouse or sweater.