I'm 5'0, currently 137lbs and my jeans are a UK size 14 (US size 10) but I can feel them getting loose by the day so I could be in UK 12s (US 8s) soon.
I'm 5'3", small boned, and I used to wear size 20, at 185lbs. Now, I'm 107lbs and wear 0 & 00 jeans. Guess my shape would be more of a banana, as my measurements are 30/23/31.