I can't tell who Horikawa's supposed to be cosplaying as, so if anyone who knows can add it in the tags that would be great.

Blue collar and yellow neckerchief is a Kagerou variant. One without a hat or headband, though other headgear is exempt, leaves you with Yukikaze, Tokitsukaze, Isokaze, and Hamakaze since the rest of the outfit is out of view.

Namazuo found a new way to collect poop.

(Sorry in advance to anyone who reads this comment)