Hmmm…
then maybe I don´t understand - but, lets say we only have roughness, metallness, diffuse, and normal-maps + no envMap + one directional light + applying sheen @Mugen87 you say, I should be able to see sheen applied?
sheenColor: 0xffffff, sheenRoughness:0.5 → I do not see a single “yellow” shimmering on the model´s surface at all?