It actually depends. There are guys who look sexy in fitted jeans and shirt. If you think you look good on it, or you are confident wearing such clothes then GO. Nobody's stopping you. But then try to experiment with other styles as well.
Sometimes guys really look cute in fitted jeans or fitted polo but don't make it a point that you'll be pigeonholed because of the way you dress.
Personally, I'm not a fan. The whole look is very college frat boy, and makes me automatically assume you're a douche bag. As for the tight jeans/tight shirt, the rule of thumb for most people is either jeans or shirt is tight, not both.