|I recently made some Jalie jeans and used duct tape to help me asess the pattern fit before cutting into the fabric. I duct taped the front and back of one jeans pant leg from the pant/waistband seam (not the waistband though) down to the mid thigh or the fullest part of the thigh extending to the side seam and CF and CB.
When finished taping, I peeled off the duct tape on the front, then the back, and placed the duct tape patterns on freezer paper and cut around the perimeter of the duct tape. Then I placed the duct tape on top of the commercial pattern to check the thigh area, however, one could use the same method to check the tummy and hip.
I used this method as a basic reference for width comparisons and thought maybe it could help someone else. The link is to my blog post describes with pictures how I used this technique.