I almost always have problems with jeans, as there is about 8 inches of difference between my waist & hips. My waist is also high waist. Typically, when the hips fit perfectly, there is 3-4 inches of gap at waist. A belt can help with 1-2 inches, more than that I feel too much bunching. What I do is stitch a little triangle on each side. I tried youtube, the only one I found is stitching straight from the back, that wouldn't work well with jeans with yokes and I don't want to mess with the double seams either. What do you do?