I'm currently three weeks postpartum after my second c section. First was an unplanned section, second was scheduled. While recovering from my first c section, I had to buy all new jeans, because my incision was tender for at least nine months, and the waistband of all of my pre-pregnancy pants irritated it.
Just today I discovered that if you fold a belly band/Bella band/Be band (the maternity bands that are supposed to allow you to wear your regular pants longer while pregnant) in half and wear it UNDER your jeans against your incision, it will help make them more comfortable by keeping the waistband from rubbing against your incision.
Wish I'd figured that out last time, so I'm passing it along in case it helps anyone else.