Inuyama's actually got like, a scarily accurate ability to estimate things. He's a total horndog, yes, but being able to figure out the exact measurements of three different girls when making outfits for them is like. Equal measure impressive and creepy. And being able to figure out the EXACT BRANDS of shampoo and conditioner someone switched to and what they switched from just from presumably smell and the actual appearance of the hair is legitimately superhuman. He could be a killer tailor.