Q. May a woman wear a man's shirt? The difference is only the direction the buttons are buttoned.
A. Horav Shlomo Miller’s Shlit’a opinion is that if it is noticeable and the shirt was tailored and sold as a man’s shirts (not unisex – see question 1356), it should be avoided.
Rabbi A. Bartfeld as revised by Horav Shlomo Miller Shlit”a.