Tory's Ben wasn't sure where his latest ($1198) windfall came from, but he used some of it to order an amazing, single-use costume based on of the funniest things he's seen online in a while: Mr. David S. Pumpkins. He's his own thing.
Clint wore a purple suit and mask. He's a little bummed he couldn't get away with just a sheet with holes cut out for eyes, but he knew how much work Pepper had put into this, so he figured he should make an effort too.
Derek wore a copy of his boyfriend's stealth suit he found online. He actually shaved for this. He's also trying not to feel too self-conscious about the whole thing.
Jemma, Fitz, and Alya opted to go more the costume route, for Alya's sake. To infinity, and beyond!
Karli is completely unrecognizable in her dress and full head mask. She completes the mystique by rarely speaking, even if she's dancing with someone.