if you're looking for a more interesting look, you don't necessarily have to shop at entirely new stores.
I usually have trouble finding t-shirts/shirts/hoodies to wear. If I go into a regular mall, chances are that I won't like 90% of their stuff.....HOWEVER, at stores like American Eagle, Macy's, Express, etc. I'm still able to find something that I like that is congruent with my style. I like a more urban look. I also like H&M and Heritage which are becoming more popular.
However, one thing- I NEVER shop at Hollister or Abercrombie because, in all honesty, that shit is boring and played out.
For jeans, I would listen to gabbythefck and go with the dark wash jeans, and be careful with the rips and holes and stuff, cuz sometimes it ends up looking ridiculous. Also, make sure they fit well. If you wanna go with skinny jeans, that's cool too, but definitely make sure they are kinda snug cuz that definitely looks better. Express and Gap have nice jeans and you can find those stores everywhere. Good pairs of jeans are MUCH, much easier to find, in my opinion.
Now, that said, online shopping is a really good choice, cuz you can find TONS of interesting clothes that are very cool and unique. Also, I don't know where you live, but I live in NYC (but in Staten Island

) , so just a trip into Manhattan is a surefire bet to find some interesting clothes. If you live close to a city, then that's a good way to go too, you'll probably find some good stuff.
Find out what you like, most famous PUA's, from what I've seen, have an edgier, urban look with darker colors, which I like, but you may not like that.
Be unique with what you pick to wear and make sure that YOU like it.