The habit doesn't make a monk - Clothes don't make the man.

To catch two pigeons with one bean.
- To kill two birds with one stone.

Either eat this soup or jump out this window.
- Take it or leave it.

(There are not two without three.)
- It never rains but it pours.

(You can't have a full bottle and a drunken wife.)
- You can't have your cake and eat it too.