Uniform Mod?

[Didz]

I've been watching a couple of tutorials by PartyMoses mainly because he was forming new Corps and Divisions and I was curious if he did anything different to the way I was doing it.
https://youtu.be/NVtz3uePlmY?si=OKZFCaZejfl4qPF_&t=2729
But I just happened to notice that when he was raising Brigades they seemed to have different uniforms to the options I have in my game, and I wondered if it was a mod, or perhaps because he has 'Whisky & Lemons'.

I can change the Jacket and Trouser colours of my brigades but i don't get a choice of style nor do I get to chose the caps they wear and some of PartyMoses brigades are wearing slouch caps.
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NVM: I only just noticed the little left and right arrows on the uniform display that allow you to change the style of the uniforms. I'm going to be playing with that now for the next hour or so.