I work with several early 20s males. Their work attire is:
Basketball shorts. Odd colors are a +.
T-Shirts with Gamer logos.
Worn out Vans shoes of various colors.
Smartphone.
Shaving is optional.
Everybody seems ok with it!

In for young women's fashion this year seems to be 3/4 (or less) tops, lots of midriff. Short sleeve and long, in two sizes, tight and extremely tight.

I am also ok with it.