If a non-pilot was to obtain a captains uniform and go to a fancy dress party, that's one thing, amusing and harmless fun
It's one thing which is not acceptable, it demeans the uniform. I don't care who or when, if you're not entitled, don't wear emblems of someone who has earned the privilege. It's not hard to figure out. Very certainly a pilot, who states being trained by military pilots would understand this, and respect them at least that much.