Dressing and dancing are, of course, two distinct things. Dress for the gig. Dance - or more generally, move - for the gig as well. You're not going to run around doing splits while playing "Autumn Leaves." You shouldn't stand stiff as a board if you're playing "Highway to Hell." Some gigs the band's job is to all be in motion putting on a big collective show, other gigs you are in the shadows while a diva singer has the spotlight on her and you darn well better not upstage her.