This globe-trotting British designer celebrated his tenth anniversary in business last year, and he s slated to open his first boutique in Manhattan this June. It s probably no surprise, then, that there was a cheery optimism to his pre-fall designs, which featured brilliant colors, perky prints, and pompom embellishments. Inspired by the Ballets Russes and a Slavic classic called La Bayadère (The Temple Dancer), Williamson showcased a ballerina print. For good measure, there were also star patterns and paisleys exploded to abstraction mixed in with rainbow-hued tweeds, Aran-style knits, and rabbit fur pullovers.