"Where's your COSTUME?
Why are you wearing work clothes?"
The Big Bang Theory Season 6, Episode 5
to wear the French
maid's COSTUME.
The Big Bang Theory Season 5, Episode 21
See, this is why I wanted
to have a COSTUME meeting.
The Big Bang Theory Season 1, Episode 6
If there's no COSTUME parade,
what are we doing here?
The Big Bang Theory Season 1, Episode 6
Oh, it's Leonard.
He wants to go COSTUME shopping later.
The Big Bang Theory Season 6, Episode 5