I live in a cost market town with a uni. The “kids” made a real effort but the outfits were a bit odd - dinosaur skeletons, chickens, pirates, a banana. Not Halloween-y at all. A bunch were dressed as traffic cones.
DD and her mate went out dressed as a Playboy bunny and Hugh Heffner. I know this might annoy some, but it was really funny and they are old enough to do what they want, and they did look great. Ironically, they are two super smart and beautiful girls, that was really out of character which made it even funnier.