What is a tuxedo?

Answer 1

"Tuxedo" can refer to a jacket, a suit of clothing, or the entire ensemble that constitutes the "black tie" dress code. The tuxedo is distinguished from the business suit primarily by fabric--its lapels and trousers seams are covered in satin or grosgrain. Traditionally, the tuxedo also had one button and "shawl" or "peak" lapels, versus the two or three buttons and "notch" lapel of the business suit, but tuxedos with notch lapels and multiple buttons are common today. The tuxedo is black, midnight blue, or, in warm weather, off-white with black or midnight blue trousers.

When used to mean the entire ensemble, "tuxedo" also denotes shirt, shoes, cummerbund or vest, bow tie, and jewelry. The formal shirt has French cuffs and often a decorated front. The vest should be low-cut, preferably with three or four buttons. The cummerbund matches the lapel fabric. Studs and cufflinks should be tasteful. Color should be used sparingly. A pocket square is advised.

A tuxedo is a a black suit that men wear to fancy occasions
A tuxedo or dinner suit or dinner jacket is a formal evening suit distinguished primarily by satin or grosgrain facings on the jacket's lapels and buttons and a similar stripe along the outseam of the trousers. The suit is typically black or midnight blue depending on choice of wear and commonly worn with a formal shirt, shoes and other accessories, most traditionally in the form prescribed by the black tie dress code.