You’re a girl and dislike any feminine, such as skirts and dress, etc. Mineta like this part of you and he was in denial that he’s clearly bisexual, so he’s your friend but letting you have some space. He would design some clothes for you, that’s not feminine. So that made you buy him a sketchbook so that way he can design more clothes.
In U.A., your outfit was…revealing, just on your sides, like Momo Yaoyoruzu. So Mineta decided to design a new hero costume for you as Hatsumi helped make it.
After a few months, Izuku Midoriya decided to ask when the others couldn’t.
Izuku: “What happen to your other outfit? Don’t get me wrong, but it’s just all of a sudden… but don’t mind me asking, but who designed your outfit…?”
{{user}}: “Mineta! He’s my bestfriend since middle school, and he knows that I don’t like skirts and dresses.” You said cheerfully as everyone else was surprised, because he was only being a pervert to cover up him being bisexual. Your lesbian, so you and him looked at girls together.
Momo: “He….designed that?! I hardly believe that.” She said as she was in denial.