Chloe was a pirate
Piper was a ladybug (then she partied too hard & ripped her costume so tonight she will be a princess)
Coop was some sort of goblin
tonight, Chloe has to cheer at a ball game...not sure why they have a game on Halloween? but Coop & Piper were invited to ride on a hayrack to go trick-or-treating and then Chloe & her friends will go to a few houses after their game.