Have you washed them and dried them in a machine? That may shrink them up a bit.
What I've found to work for jeans that are a half size to big, or stretched from wearing, is to put them in a pot of boiling water for 20 minutes (easier on them then a washing machine) then the dryer on high heat. You may lose some length though as well, so be careful.
Thanks for the advice, I will try.... hoping not to shrink them at length too much haha