God says men should wear dresses!

Deuteronomy 22:5 says, "The woman shall not wear that which pertaineth unto a man, neither shall a man put on a woman's garment: for all that do so are abomination unto the LORD thy God."  Now let me get this straight.  Back in those days men wore tunics.  Does this mean that men should wear the equivalent of skirts?  Did people wear pants in those days?  When were those days?