…and here we go 
No that doesn’t work that way. Piercing, tattos, watches that is a different layer added to existing model. Outfits are different thing because it’s created as single asset. That would force them to redesign each single game asset like gloves, shirt, hats, boots etc and there will be a problem with collision of object from diffrent models. You think it’s so obvious because you as a player - see a single image. But from backend and technology pesperctive is a totaly different story.
Right now whole outfit is animated as single asset, and when you allow to make customizable ouftits you need to make a every object as standalone asset with own animation etc. That force to redesign whole outfit system and that will never happen.
And I’m glad that will never happen because it might make people demand
“I want to have tattos, glases, mustache, change color of hair… yeah we want to change skin also! Why not?!”
“why there is so small amount of custom parts, we need more!”
etc. That will open a topic to complain about game’s character customization - and this isn’t good for Hitman art direction.
From other hand - IOI put a lot of effort to create that vision of 47 with black suit and red tie with perfecionism and pendatism . There is intentional purpse why that is a strong art direction. And when you allow player to customize your own 47 - that destroy that art direction and narrative of 47. That maybe fit to online games with bland characters, but not for Hitman game.
That is also why im against that kind of funcionality. You may say - “but there is a plenty of weird outfits already”. Yeah, but it’s in control of their art direction, most of them fit quite well to vision of 47.
Just read about that in Cyberpunk 2077 or Fallout 4, where people had a quite big customization options but that still maked them unhappy because there wasn’t enough assets to do what they want. It’s just a pandora box. From developer perspective - it’s just a hudge problem with no impact on quality of game. I’m personaly also a designer - thats why I’m understand that UX problem from higher perspective.
No, just no. Go play GTA V instead
I really don’t see any point why Hitman should have outfit customization since every single starting outfit works exacly that same. It’s just a cosmetic feature without impact on game mechanics, so it’s pointless. It’s just a waste of resrources which can be used to create a weapon customization (by mean - a funcionality not skins…) which could have much bigger impact on game mechanics and gameplay it self.
BTW: IOI don’t want to redesign simple MKII items and you demand a whole outfit customization. Dream on 