Pre-dressed pets: the tuxedo cat
Previously: the tiny lord of the dance.
The black cat with white bib and paws is always impeccably dressed, so on Halloween, he's James Bond -- or, if you're concerned about his involvement in dangerous car chases on the Riviera, a crisp maitre d'.
Any other tuxedo-wearing function, or functionary, will do (George Clooney; a prom date; the groom).