(Daphne and Martin are arriving at the Seabee Awards dinner and Frasier compliments Martin on how good he looks)
Martin: Well, thanks -- though I guess any guy looks good in a monkey suit.
Frasier: Oh, yeah.
Daphne: On the drive over I started musing on why they call it a monkey suit...
Actually, Martin isn't wearing a "monkey suit". A "monkey suit" refers to a tuxedo with tails (the back split and extending down in two curving flaps to the back of the knees). If Martin had been wearing a tuxedo with tails (commonly just called "tails"), Daphne wouldn't have had to wonder about the origin of the term.