All you need is an all-black outfit and a black cloak to complete the costume-and to speak in a menacing voice. Be the Squid boss with the angular black mask inspired by Squid Game. When your social schedule calls for something a little more sophisticated and less creepy, black panther costumes any costume that involves a blazer or a suit can work. A more significant question to ask would be, the joker costume when was the term “cosplay” coined.