usually grailed sometimes offerup

depop have gotten amazing gems for $5 and if im buying designer then farfetch

Thrift is the correct answer

The Soup Store

Old Navy/H&M

Grailed, Depop and Ssense

A good idea to find your own style is to see if you can make a good/cool fit out of a plain tee and some jeans to make sure what your ideal “base” would be for your fits before you go and splurge on alot of stuff you might not like in hindsight.

Or just go thrifting like others have said.