I haven't seen any shiny plastic-looking ones, only treated cotton. Try Nordstrom Smartcare.
What should be in my undergraduate wardrobe? - Page 3
Styleforum Top Picks
I'd recommend getting your basics from a store like Uniqlo for a few hundred and then spending money on accessories like boots, watch and leather bag. Devote a hundred or so on interesting things that appeal to you that aren't necessarily essentials (Like ties? Wear a tie whether or not it's cool - go crazy). That was pretty much what I wore for my entire time on campus.
If you dress the way you want, you'll probably find people dressed similarly (eventually), who may also be like-minded. It might be helpful for an introvert, as you mentioned you are.
Just my opinion!