I recently picked up a pair of Levis 511 Rigid in a 33 x 34. the denim is 99% cotton and 1% spandex. my true waist size is 32, but i decided to size up to a 33 because i recently gained some weight. since 511's are made skinny i figured sizing up shouldn't change the fit too much. how much will the 511 stretch to? i definitely like how the 33 fits on me right now. the thigh feels good, snug but not tight, and i also get some sag. i own a 514 in a 33 as well but after wearing it a bunch the waist got too loose. it got loose to the point where i can pull the pants down with only some friction.