Gender is all the sociological stuff. Clothes, expectations of behaviour, stereotypes.
Rubbish. You can't change gender by behaving differently. If I was to wear a dress, my gender doesn't change to female. My gender is still male.
And in my case, I actually don't care for, or conform to, the stereotypes. I just wear the clothes that are comfortable, I behave the way I want to, and I like the things I like. I don't care whether they are perceived as being "masculine" or "feminine", because I'm not a teenager and I am well beyond those insecurities. So what would you say my gender is? Would you call me "genderless"?