https://twitter.com/dieworkwear/status/1797170834429313181
If you have a large seat which is the polite tailoring term for “ass” you can use darts to make the pants follow your curves. I will demonstrate.
In the clothing industry, pants are typically made to fit someone with a 7" to 8" seat-to-waist ratio. If you have a large seat, this means that if you find pants that fit your seat, your waistband will be too big. So what can you do?
You can fix this by having a tailor add two darts to the back. This works for both jeans and tailored trousers. Darts turn flat pieces of fabric into three-dimensional forms, which helps clothing follow curves. Some illustrations from the tailoring blog Tutto Fatto a Mano.
“Can’t I wear a belt?” Yes but this will result in excess material bunching at your waist
“Won’t I have flappy legs?” You can taper legs from knee down
“Can’t I wear stretchy pants?” Yes, but many don’t age well
Only giving info on alterations, not saying how to live your life