Personally, my fashion is very "geek", I wear a lot of reference t-shirts with either jeans or just other trousers. I have a few clothes that I bought because they were fashionable. However, I dont buy much as I dont really have the money.
On the other hand, I am very involved in fashion as a whole, I read lots of fashion blogs, and read all the magazines. People always seem surprised about how much I know, considering I dont pride myself is wearing fashionable clothes 😛