“A woman must not wear men's clothing”
A woman must not wear men's clothing, and a man must not wear women's clothing, for whoever does these things is detestable to the LORD your God. (Deuteronomy 22:5 BSB)
What it sounds like today
A blanket ban on wearing the opposite sex's clothes.
The cultural key
The command guards the male-female distinction woven into creation ('male and female He created them'), of a piece with the other 'do not mix' laws that keep created categories clear. Many scholars also connect it to specific pagan worship, where ritual cross-dressing featured in fertility cults of surrounding peoples; to imitate those rites was to court their gods. The strong word to'evah, 'abomination,' marks it as a boundary God takes seriously.
Recovered meaning
The law protects the distinctness of male and female as part of the created order, and likely steers Israel away from the cross-dressing rites of pagan worship. Like the bans on mixed seed and cloth, it treats God-given categories as things not to be blurred.