- To enhance one's body (appear more attractive, muscular, thin, etc): being thin is inherently better than not, so I want to appear more thin.
- Self expression of any number of things: it's important to me that people not kill animals, so I'll be conspicuous in the ways I don't wear leather.
- Aesthetic taste: I prefer the look of the color red, so I'll wear it for my own pleasure.
- Entertainment: keeping up with fashion is stimulating to me, so I'll do it for fun.
Could you expound on why you think these things signal status in some way?
I also think this thread is missing the point slightly: status signaling doesn't explain every clothing decision ever made by anybody, but it does explain why fashions change the way they do.