Abu Hurayrah (ra) said: "The Messenger of Allah (saw) cursed men who wear women's clothing and women who wear men's clothing." (Abu Dawood)
Imaan Al-Nawawi (rh) said: "This shows that it is haraam for men to imitate women and vice versa, because if it is haraam with regard to clothing then imitating them in one's movements and tone of voice is even more abhorrent. Therefore, it is haraam for men to imitate women and vice versa with regard to clothing that is unique to one sex, and the one who does that is subject to the threat of being cursed."