They're often white in warm weather

Usage examples of tuxedoes.

The two human men were in tuxedoes, the Vulcan woman wore a skintight suit embroidered with Vulcan script (not the formal wear Palais tradition would have preferred, Esperanza suspected, but the woman did need to be able to do her job, and a loose robe would not have accomplished that), and the Trill woman wore a sky-blue one-piece dress that was sleeveless with a slit up the side of the knee-length skirt, which Esperanza suspected was there more for freedom of leg movement than fashion.

There was a big crowd there and twenty long bars of polished mahogany or gold behind which white-skinned androids in tuxedoes served drinks.

In the storm of tuxedoes and black evening gowns, it’s even possible to overlook the brown oak of the walls.