anisotropic shading... in case u are not making videogames or looking at 3d renders all day is basically when you have long stretched highlights bc of grooves. like CDs, fur, silk/other types of cloth.... and hair!
i feel like velvet/cloth-like shading is just a cool direction choice bc it gives them a grounded real world Feeling without being a weird too naturalistic/next gen-y expensive fur mess haha