I'm upset that my wife intentionally let my sister-in-law see me naked
What's going on between you and your wife?
We are in the middle of a divorce.
If she deliberately did that, then that's disgusting.  You shouldn't try and engineer situations where you can show your partners naked body to other family members.  It sounds like splitting up with this woman is a good idea on your part!
Maybe I will break the dresser in our room.
It is wrong what she did but you should not destroy possessions over what happened. It might be good to move out and just speed up the separation process.