A Ukrainian blogger gave some background on why it's so important to wear military-related clothing in Ukraine
Illia Ponomarenko:
https://nitter.poast.org/IAPonomarenko/status/1896142621615272013#m
"FYI, Zelensky’s semi-military official attire represents a very, very important aspect of life in Ukraine right now—tactical clothing and various gear that is worn by everyone who has any connection to the war and combat operations."
[....]
"One crucial rule—civilians (unless they are demobilized veterans) have no moral right to buy and wear camouflage clothing, whether it’s Multicam or our Ukrainian military patterns like the army’s "pixel." In this community, it is considered immoral and unacceptable. Camouflage is a mark of honor for a soldier. Want to wear it? Take the oath and join the military.
But if, for example, a civilian involved in the war effort wears tactical clothing in black, gray, dark blue, olive, or beige—there’s no issue. It’s practical, and it fits the times.
This is exactly what Zelensky does when he meets world leaders in front of the cameras in semi-military tactical attire. He represents a fighting Ukraine, where millions of people are not just serving in the armed forces but also contributing to the country’s defense for the sake of a common future in their homeland.
And Zelensky does it the right way—he deliberately avoids wearing an official military uniform or camouflage, which other politicians have shamelessly and absurdly used for self-promotion.
Yes, he is the Commander-in-Chief, but he is not a soldier, and even he does not have the moral right to wear camouflage, which is sacred, because it is in that uniform that Ukrainian soldiers shed their blood for our country and heroically fight against one of the largest and most ruthless armies in history."
Further text in the link; I edited it so it's not the full quote.