Sorry dude you have NO idea how much I care about the current project I am in. I'll let my playing and stage presence do the "talking". Nice jeans, shirt, and shoes are all that is needed. If you put more into clothes you probably fall into the poser category.
One thing that really stuck out to me when I read Miles Davis' autobiography is when he talked about bonding with other musicians because they were into clothes, too. I'm not sure anybody would consider Miles Davis a poser. Caring about how you present yourself isn't being a poser, it's being smart and realizing that everything matters.