Why not just manipulate Assembly-CSharp.dll directly?
I've just had a quick glance at the code, so I might underestimate the difficulty - but to me it looks easy enough:
View attachment 4123260
Edit: Just tried it, and it works (it's from a fresh start on day 2):
View attachment 4123300
This one's from day 1:
View attachment 4123312
I'll attach the dll (I hate, that it gets falsely flagged as a virus - but eh, it's a mere proof of concept anyways).
Just be aware, that it's a quick and dirty edit of the unlock-able clothes to see, if it works.
I don't know, if it might cause any problems to own clothes before you're supposed to (I don't think so, but it still warrants that note).
At least now you know, that editing Assembly-CSharp.dll is one easy route.