THIS Sunday, scores of men — some celebrated actors, others appendages to famous glamour-pusses — will expose themselves to the scrutiny of the world and, more alarmingly, Joan Rivers as they stride the red carpet at the Kodak Theater in Hollywood.

Most are likely to be clad in what is surely among the more foolproof dress uniforms ever devised: the tuxedo. Yet few will manage to get it right. Why is that?

“Men take advantage of their advantages in general,” Fran Lebowitz, the humorist and herself a tuxedo wearer, said recently. “But not with this.”

Despite being given what Ms. Lebowitz termed “this perfect thing to wear,” both stars and arm-pieces are certain to commit sartorial blunders at the Academy Awards. They will wear their pants too long and puddled on their shoes, as Brad Pitt did at the recent Screen Actors Guild awards. They will wear businesslike four-in-hand tie knots, as men like Robert De Niro routinely do, and not the requisite bow tie. They will turn up in suits that fit as though borrowed from Dad, or in shirts with wing collars best left to maîtres d’hôtel, or in colors that make them look like Steve Van Zandt.