There's a bit of writing in that direction if you're curious. I like Benjamin quite a but and have gotten a lot out of his thinking. Here's the wiki-level entry to it:
They like purity. Purity of the body (fitness and lifestyle) and purity of society (regimentation, conformity, single race, single ideology, single sexuality, standardized architecture).
It's neurological. They feel emotional disgust if the regimentation isn't there.
They're usually not good at hair, for whatever reason. There's Hitler, of course, but also look at just about any American far-right figure these days for some _truly_ unhinged facial hair.
Offhand, the only totalitarian I can think of who seemed to put in a particular effort on hair is Stalin. But in general, stylish clothes, mad hair seems to be the rule.
So did the German Nazis back then now I think about it.
Maybe there is something with cult-like thinking, fascist or not, where the aesthetics seduces more people into wanting to be a part of it all?