We got glass heels in Vam before we got GTA 6 :D
Of course they are a CUA object that auto parents & aligns to the foot bone with Stopper's CUAclothing plugin, With regular clothing this is impossible since it doesn't support custom shaders by default. Tho that might change in the future if i manage to make the shader work on native clothing. it also has my modified version of shoe helper that allows very long colliders (Originally made by Stopper).
Enjoy! (Download in discord)