Often attacked at being nothing more than PJs, I actually like the TMP uniforms. I actually think, based upon my one visit to NASA while active in the military, they looked the most realistic.
Although I love TREK 2's uniform, its my favorite, I just don't see it being worn in the 23rd century. I also never cared for TNG's uniform until the switch over for First Contact.
But anyway, the TMP uniform may look sterile, and boring. But for realism I am willing to bet that if they ever have space ships, or space stations, going to Mars or whatever, the real uniforms will look more like TMPs than any other uniform TREK has ever shown us.
I quite agree although I like the TMP uniforms much better than those that followed which I always thought looked ludicrous. Also, as the '70s recede ever further into the past I feel there's less stigma and connotation attached to the designs.
Indeed, overall, TMP is the least dated looking of all the Trek films in terms off design and aesthetics. It's holding up better than some might have once imagined.