Buying a new frock is not an activity I relish. I wish it were. I want to be one of those women who catches a glimpse of a something shiny on a rack on the far side of the store, tries it on, loves it and whips out her credit card, all within the space of five minutes. Me? I prowl the floor like a hungry snow leopard, and after much deliberation, grab an armful of frocks that seem promising, try them on, hate them and repeat the process until I end up hating myself. At 57, I blame my