Thank you, Chemi! I appreciate you looking into it. I made a few adjustments to the fitting of the thigh piece so I could better illustrate the issue I'm working with. This is the thigh piece with the triangular gap and the angular ridge:
I then adjusted the bottom tape to simulate how the piece would look if it were completely level. In this case, the two sides between the gap where the plastic is added is parallel:
Personally, I prefer the look where the bottom is more snug to the top of my knee and the ridge is angular, but it's all contingent on what is garrison approvable. As always, I appreciate any input!