What does it mean if you say that someone is crossdressed?
Well he's not 'cross' meaning angry, but he's dressed.
And what does the word 'sissy' mean?
Well the dictionary says;
effeminate, lacking stereotypically masculine qualities; cowardly, timid plus coward and timid person.
So do sissies wear women's clothes?
Well a great many do and they wear women's make up, and also love to walk, to talk and to do many other things that women love to do.
Is it normal?
Well most people that wear clothes normally worn by the opposite sex are simply men or women trapped in the wrong body, and they're seeking expression.