What an interesting question (and how happy I am that I can get on YLF on my computer now and use my keyboard, because I'm going to *E*xpound; I love to *E*xpound :D).
I think it's interesting because, to me, clothes are always always telling. But I was a shop girl, and maybe shop girls don't count - or shouldn't.
With regard to myself, every few year I get an attack of ghetto fab and just revel in logos. The giant Polo logo that Ralph Lauren introduced was just hilarious to me. It did have a certain wit IMO and thus that je ne sais quoi.
I am also a traditionalist, so I wear my Native Costume quite a lot, which is pretty identifiable. (I suppose I should mention here that I'm from Hippy Dippy Land and am as WASPy as you can be without being W, A, S, or P, but what's a person to do?)
Then again, I do like a certain plainness even while at the same time I'm ok with being notable. I want to make the world turn, and flash doesn't lend itself to that, so I don't like to be too sharp and stop traffic.
Do you think maybe it's this kind of plainness that you really mean by unidentifiable? Did you know it's against the bankers' dress code to wear Rolex?