While I am a fan of the TWOK uniforms, I also agree with this. In the grand scheme of things, the TMP uniforms fit into a template, a gradual progression from the TOS uniforms right through TNG, DS9 and beyond. The rank insignias of TNG owe far more to the TOS and TMP template than is often acknowledged.On the flip side I've always disliked TWOK uniforms. These definitely didn't look like future wear. They looked very retro and not at all believable as comfortable everyday wear. The TMP uniforms look credible as an evolution of what we saw in TOS although I'd argue a little more colour was needed. And it's easy to see an evolution from TOS to TMP to TNG and DS9. TWOK uniforms don't look even of the same universe. Instead of tweaking the overall TMP concept (in which we might have gotten something like the TNG concept only years earlier) they simply reacted by making an arbitrarily drastic change that was wholly inconsistent with what had come before. Indeed the whole feel of TWOK is like a reboot where they want you to forget TMP as if it never happened...but thats really a different discussion for another time.
By contrast, the TWOK uniforms are a clear violation of this. They're off doing their own things. When stacked up alongside the rest of the uniforms, they're a clear aberation in what is otherwise a fairly smooth evolution of styles. Even TNG seemed to acknowledge this, as flashback sequences featuring the TWOK uniforms often made pains to (for example) remove the undershirts, somehow trying to fit them into the chronology, to try and create some progression between them and the arguably more casual open-collared versions seen in TNG's first season. If you look at the uniforms of Star Trek as a whole, the TWOK ones stand out. And not necessarily in a good way, sometimes.
That said, I am a fan of them, and I think they're probably Trek's most stylish uniform. But I definitely agree with Warped9 that they don't tend to fit very easily into the chonology.