Jeans and a t-shirt

All I ever wear is jeans and plain t-shirts. I would like to add a little style to my clothing collection and have a more varied wardrobe, but I just have no idea where to begin. I feel like if I take any fashion risks at all, I will end up looking like the wacky neighbor on a network sitcom. Can you give me any style tips or rules of thumb? Any online stores I should check out?

How does someone with no style or fashion sense go about building a wardrobe?

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