M'Ress' uniform is covered with a mind-boggling tangle of textural and procedural nodes the creator of the miniskirt mesh assembled. Thus it projects that early 1st season "velour" shimmer. Spock's tunic makes use of clever "displacement" to elevate the surface of the rank braids and department "chevron" so they don't just look like the flat textures they really are. (Of course, this render is too small to show off that detail, but at least you can zoom in insanely close without the patterns "pixelating".)
Bear in mind Oshikai made the mini-skirt uniform and a someone listed as TimG made the male uniform textures for what is sold as a fantasy medieval outfit. They deserve the texturing credit.