We used muslins when ds was really small, and folded them into a triangle, then again. The sides got folded down between his legs as a kind of booster (and an extra booster put under too when he was a bit older) With the thighs rolled in it was really good at holding bf poo
After he was too big for this we did the ?origami/chinese fold? Don't remember the exact name, but looks really tidy and like sumo pants! Now we use a jo fold and it's really good. Hope you find something that works for you!