Do female to male crossdressers exist?

Yes. Sometimes one partner in a lesbian relationship takes a masculine role, and tends to dress like a man or boy. Other times, women just prefer men's clothes to women's.

Answer:Yes. I know a few. And no, 'butch' lesbians are not crossdressers. They are not actively trying to appear to be men. A 'girly' lesbain doesn't want a man. She wants a masculine (strong appearing) lesbian.

A crossdresser specifically wants to present, and be seen as, the opposite sex. Wearing whatever clothing to feel physically comfortable (fits better..) does not make a crossdresser. It is intent to appear as the opposite sex, not the actual wearing of it. I can only wear women's gold bracelets because my wrists are tiny (7.5") - I've never found a man's bracelet that small. When I wear my bracelet, I am not crossdressing because I don't want to appear to be the opposite sex, it just fits. I don't care if it's male or female.