Do I have no waist?! I am a size 16, and all my trousers fall down all the time-I figured I was buying them too small-so I bought some more in a bigger size and THEY still fall down and I'm hitching them up constantly. Is there a magic jeans/trousers cut that i don't know about that will stop this?! And I do wear a belt but they still slip down. Do I need to buy old fashioned denim with no stretch in it?! Help!