This Old Testament verse speaks about men and women dressing contrary to their sex. While this may seem like an out of date verse, it isn't just about the clothes, but the heart of the person wearing the clothes. Our actions, words, and even clothing reflect our sinfulness and rebellion against God and this verse is no different.

(As a side note; I know many today will be extreme and say women shouldn't wear pants or certain shirts because it pertains to a man. But even today women's pants, shirts, and even shoes are designed and tailored for a woman's body so there is a distinct difference to a man's pants and shirt.)