[ Alberto scoots closer to Katsuki and holds out the example pair he'd grabbed from the closet. He reaches one hand inside to splay out the hole in the seat of the pants, sticking his fingers through the hole (and wiggling them for added effect) as he flips the seam over to show Katsuki his work more clearly. ]

First — this is what it's supposed to look like. You can use whatever you want to close it. I like these little snappy things best, I never had those back home, but if you— I mean— ...do you even need to close it?

[ Alberto none-too-subtly leans backward and eyes Katsuki's butt trying to catch a glimpse of his tail again with a discerning look. ]

Does it ever go away? Or is this just— the new you?

[ Guess that's an important question to establish before they get into the mechanics, huh... ]