Hey, thanks for the welcome!
Hmm... Well, Ganzo perhaps wouldn't mind that the suit was dirtied, but if this happened during middle school it'd be another history. Here is an idea I had pretty quickly too:
Ganzo bumps into Taigi and lets one of his books drop on the ground, Taigi accidentally sees the book and discovers it to be a very weird book(still deciding between eroge or one of Misheru's fan fictions) and Ganzo basically starts avoiding him because the situation gets very weird. This could also happen if Taigi caught Ganzo's diary too, in which case Ganzo would hide it from Taigi.
We could also go with your idea and, in that case, it happened quite some time ago, perhaps not even inside school, and Ganzo still wants to be refunded the cost of the suit, lol.