In the film
Office Space, the manager of
Tchotchkie's (played by director
Mike Judge) berates an
employee for not wearing enough
flair. She's only wearing 15 pieces of flair -- the bare minimum -- and he wants her to want to wear more of it.
In this case, flair refers specifically to buttons attached to one's suspenders. The ideal, I suppose, is to be unable to see the suspenders at all.