Blue Checkerboard

It's now time for the boys to figure out what to do for Cai's birthday. They've decided that giving Cai presents is the best way to go about it. Cai asks what he can give him for his birthday. He wants to buy him some clothes, but he can't figure out the exact size of his own clothes. He's not sure how to ask Cai directly, so he's going to have to ask someone else. Cai is a little confused by the whole thing, but finally he figures out that Cai is wearing the exact same clothes as he is.