Alexis Mabille was recently made an official member of the haute couture club. It's a rarefied clique, with only 16 other houses on the list. Before his show tonight, he said he set out to impress the Federation with his technique. "In the past, I focused on structure," he said. "Here I concentrated on the craftsmanship —what we can do for the client." His attentions paid off. This was a finer outing than usual, less zany than many a Mabille show past.