Place it at the reveal, just as the full black outfit comes into frame, then follow it with a reaction sound for the group's response. Keep it as the setup beat before the laugh, not the closing sound, so the outfit joke stays the focus of the edit.
Über diesen Sound
This two-second clip is a quick spoken line naming a black jacket, a black tie and a black shirt, delivered in a brisk, matter-of-fact voice. The plain listing gives it a deadpan, slightly absurd charm, turning a simple outfit description into a funny little punchline that feels confident and a little cheeky.