TMP uniforms are the most realistic. Visually a bit boring. Wrath of Khan uniforms were so thick and heavy. They must have been torture for the actors to wear.
They still are. The people who make uniforms for costuming warn about this. They are made of wool, lined, double breasted, and over another layer. Most unpleasant in hot weather.
Probably no fun under camera lights either. Probably had extra people on the set just to mot the sweat off the actors before each take.