See this article.
I’m waiting for a Chassidic Machon for Textile Research where clothes are crafted in a way to provide a cooling experience, like an ice vest and thereby preserve the look, but not the feel, of the mandated uniform.
As time goes by, and we over-focus on form, content seems to suffer. When I was a boy, R’ Zalman Serebryanski ז’ל used to wear a mid-grey Kapoteh. Yes, it wasn’t black. His hat had a very short upturned brim. But then, again, he was a Chassid in content and seemingly less troubled by form.
It’s interesting to note that during the weekdays, other Chassidim, such as Ger, often don a standard fedora. Unless I’m mistaken, in the days of yore, they wore a Poilishe Hittel-one of those Donny Osmond style caps. I’m also skeptical whether the standard Chosid always wore a white shirt during the week. Did they?
Curiously, the Sefardim (at least those of them that don’t try to emulate Ashkenazim) didn’t have a dress code that required them to either all dress the same, or wear something akin to the Chacham.
And finally, we did change our names, clothes and language after we left Mitzrayim. Maybe that’s the answer: let’s go back to what Moshe Rabbenu wore?
pitputim 
In regards to wearing white shirts only at least in regards to lubavitch bochurim, I have heard that it is only a recent trend. I believe there was once a large phone hookup organised by Rabbi Hertz of London with the majority of lubavitch roshei yeshivos/mashpiyos participating. I believe the gist of the conversation was that although lubavitch is not into chitzoiniyus and therefore until now has had a relaxed policy in regards to a uniform. However nowadays the bochurim have used the opportunity to be more involved in their chitzoiniyus (ie. making sure they get different colours for each day and that the shirt has to match the pants etc.) Therefore they established the set rule of white shirts with black pants etc.
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