Spending money on workout clothes

Do you spend lots of money on coordinated workout outfits or do you just wear any old comfortable pants and shirt? I've always been the type to just wear sweats and a t-shirt, but since I've been getting into yoga, I've been changing my tune. When I research the different yoga routines on www.yoga.com, I see some really cool outfits in the pictures and I think I am going to make the investment to get a few. If it makes me feel good about myself, I say why not, right?