You don't pay too much attention to fashion and far be it from you to spend hours on designing outfits which could shock your friends. If you ever shock them it's by how little you care about the clothes you're wearing. The only thing you pay attention to is not to look ridiculous. You don't need to draw attention wherever you come but you definitely need to know you are not the object of jokes. You are happy to blend in. I'm sure this approach leaves you a lot of time and energy for more interesting things than fashion.
The opposite style from yours is Catwalk God(ess) [Flamboyant Original Deliberate Sexy].