Probably for comedic relief, or that the outfit has a really high stat. But I mostly think it’s to make the comic more funny.
The mc in past life make him wear that to win the game because it have high stat despite it looking weird (or maybe bcz it looks weird that it have high stat) . So when mc transmigrated the game character would automatically wear the last outfit he have wore in game. Ofc from author perspective it's for comedic relief lol
I'll be honest with you guys. I just think it's funny to dress my big buff male characters in video games naked or in a dress. I think he thought it was funny to run around dominating enemies with his PC in a dress.
first of all, why did they dressed him like that, author must be a fan of sailormoon or magic girls