I HAVE MADE A BREAKTHROUGH in the psychoanalytic study of fags, or psychofaganalysis—thanks to Thierry Mugler.

At “Thierry Mugler: Couturissime,” a retrospective of his oeuvre at the Musée des Beaux-Arts, Montréal, I was able to answer a question that has long plagued psychofag-analysts.

The question: Why do fags so often create fashion?

The answer: They don’t create it; it creates them.

“Couturissime” displays more than 150 of Mugler’s designs. It includes runway showpieces, projections of runway shows and music videos, and costumes he designed for the Comédie-Française, a theatrical company that’s