Let's not get caught up in semantics and word games. The point is that there is an approach to dressing, whatever you want to call it, that greatly values the stabilization of its component forms. That's what I mean when I say "classic menswear" or "classic men's tailoring" or "classic men's clothing," etc. There is often no good reason for why such component forms have stabilized the way they have. Half the stuff we wear evolved because men used to ride horses a certain kind of way. The other half has roots in social customs and court dress that could not be further from today's practical reality. Yet, stabilization has value even a stout modernist should appreciate. It provides a toolkit of components that are pre-defined and that have grounded, predictable meanings. We can learn to "say" a lot of new things just by learning to use those components.
Good modernist thinking is about truth-seeking, objective improvement, etc. In many other expressive forms, such as architecture and art, it's led to significant, even traumatic, change. Yet, in most of those cases, such changes made sense because they were cost-effective. As technology improved, it made sense to build buildings differently. There is no added cost in painting a new, different kind of painting. Yet, here we have "classic menswear," stuck in the mud. Is that an affront to modernism or something else? I actually think it is the latter (here, I think Fuuma would most strongly disagree). Why? Because technology has not provided us with sufficiently superior clothing solutions to make it worthwhile to dump the old norms and their communicative value. If a good modernist should seek to maximize a thing's capacity to function, and clothing is in no small part about communication, then he should also play the conservative every now and then--as significant adjustments to the meanings of things occur over generations, even centuries, not seasons or years. Incidentally, this is why you don't hear about many modernists trying to invent "better" languages.
As for postmodernists--well, they can go fuck themselves.
It's an issue I've been pondering with little success for a while, and I don't really have much time to elaborate. Someone should.