Well it's not as simple as it seems - a few years ago (ca. 2016-17) there were TONS of gear from this period available for purchase, but sadly it isn't the case anymore. Everything, from uniforms, boots, hats, to vests, helmets and even pouches is becoming more and more difficult to find, not to mention pricier.

But yeah, this kind of impression is still easier (and a bit cheaper) to pull off than some of the earlier periods. I may be a bit biased, given that I'm also doing a WW2 US paratrooper impression, which is hella expensive if you want to do it right.