tuxedo

This term refers to a specific level of formal dress known as black tie. It is distinct from a standard business suit due to the satin or grosgrain facing on the lapels and buttons, which signals a higher degree of formality intended for evening social functions.

In North American English, "tuxedo" is the standard term, whereas in British English, the garment is more commonly referred to as a "dinner jacket." Using "tuxedo" in a UK context is understood but may be perceived as an Americanism.