I pay little attention to the kind of celebrities who would dis-influence me, but I totally understand where you are coming from.
Ironkurtin makes an excellent point though. If you don't look like you're copycatting a tacky celebrity, buy the clothes if you love them. It's not their fault who puts them on.
I do avoid retailers who are closely associated with celebs who put me off too badly though. There are lots of other stores out there.