Gaydar

How can you tell by looking at a woman that she is a les-bi?

So far I have heard of the index/pointing finger being longer than the ring finger, short nails, Birkenstock boots, driving trucks, openining beer bottles with staple-removers(Chagmion Antoine;-) )

Do you gals have any others that have to do mostly with physical appearance?

P.S. I live in NYC and the whole short hair, short nails, sensible shoes thing doesn't work!

I have no gaydar.

Help!