I've always been a size 10 but have put a small amount of weight on and now my jeans are very snug and uncomfortable, mainly around the belly area. Have tried losing weight to no avail so I went to go and get some size 12 jeans but they're too big! Too big on the bum and too big around the crutch. I even tried on the exact jeans I wear but size bigger and they don't fit, what am I supposed to do?