I find Lands End cotton knit pants--long, cropped, and capris--are not irritating at all. They're stretchy, loose enough, and are thick enough I can slap gel packs right on top of them. They're my comfy go-to pants, and I even had two pair during my rehab stay.
This past week I started wearing other pants in my wardrobe. Linen is a little rougher on the skin (who knew? I never noticed before this) than cotton knit. The pair I wore yesterday (linen) had a seam down the front of the pants leg. Guess what? It rubbed the incision at times when I was sitting. Not badly, but noticeably, so do be aware of seams down the front of the pant leg.
A pair of chambray pants I love and which usually are not tight, were kind of tightish on me. I think slim leg pants will be dicey for a while. Your mileage may differ, of course. But I am liking the looser, baggier pants for this recovery period. I like looking stylish, which is somewhat possible with recovery clothes, and wide leg pants are on trend this summer, so that's a win!