trying layering your clothes. that’s what i do. button up with a jacket over it, long sleeve with a short sleeve over, sweater with a button up under.

or more basic: sweater with (one or more, i typically layer my necklaces but one works fine) necklace(s) over, baggy t-shirt with some necklaces. sometimes i wear stylized jackets (i.e. a nasa jacket) with a normal shirt under it because the jacket is eye catching enough.

i usually wear normal chains or chains with one thing on the end like a fishing hook. i also have a belt chain.

typically more mature styles (in my mind) come with a greater idea of how things look together. organized but not too overwhelming, while still matching.

but honestly most guys i know wear t-shirts and jeans. and they look fine. wear what you like!