I wear what I like. I don't care if it's 'in style' or not. Trends come and go. What I like changes a lot too, and generally change independently from trends. I've never disliked something simply for being out of fashion. Likewise, I've never LIKED something for the sole reason of being IN fashion.
How to have your own style: Have a mind of your own and try not to care so much what others think. Wear what you like, not what society tells you you SHOULD like. =] Easy.