leggings are mostly 77% polyester and 23% spandex but there’s a mesh segment behind the knees, mesh is 93% polyester and 7% spandex.

I don’t know if you’re suggesting I cut the legging and make it thinner right below the knees, but this is a structurally very complicated area, as it combines mesh and regular fabric.

Have you ever sewn workout synthetic fabrics? Are you happy with the result?