It's not that large a game, but hey, it has a few cosplay outfits!

This isn't exactly a Cosplay, it's official Yotsuba art, but I thought it'd be better to give the source for it as well. It was from a picture compilation of Yotsuba in different seasons, this one being spring if I understood correctly. I presume it to be about Children's day or something like that.

Higurashi Kagome, from Inuyasha

Edward Elric, from Fullmetal Alchemist

Uzumaki Naruto, from Naruto (duh) The Shippuuden outfit

Azumanga Daioh winter school uniform What would a Yotsuba game be without an Azumanga cosplay?

Sailor moon, from Sailor moon (duh)

Monkey D Luffy, from One Piece