I never thought low rise pants or jeans were all that flattering to anyone except the skinniest of women or girls. So when they came out with that style in breeches I was not surprised that again they are not flattering!
I think they cut the torso in 2 in the wrong spot. And when on a horse the look doesn’t improve…just my opinion for what it is worth.
I agree with the other posters who mentioned the higher cut breeches with a belt or the wider band versions. Add a more boxier style polo shirt to soften the look, rather than one that hugs your shape…