This patch extends the old Velvet BSDF node with a new shading model, and renames it to Sheen BSDF accordingly. The old model is still available, but new nodes now default to the "Microfiber" model, which is an implementation of https://tizianzeltner.com/projects/Zeltner2022Practical/. Pull Request: https://projects.blender.org/blender/blender/pulls/108869