cross-dressingnoun [ U ]
uk/ˌkrɒsˈdres.ɪŋ/us/ˌkrɑːsˈdres.ɪŋ/the act of wearing clothes usually worn by the opposite sex:
There's a lot of cross-dressing in British pantomimes, where men dress up as Dames and a woman plays the part of the young hero.