[WingsToDiscovery]

If your average attire consists of jeans and t shirts, than I suggest looking into what style is in general, rather than a specific genre. If you're not stylish/have no taste in style to begin with, all you'll be doing is emulating what you see rather than actually being creative. This is why some people have "fashion sense." Jeans, t shirts, and hoodies aren't stylish by any standards no matter where you're from.
Start out by studying what girls around you where (or friends who have style), and then learn to twist it to find something that suits you(obviously stuff that you like/would like to try and wear).