Interestingly, the commentary on Article 85 of the Third Geneva Convention includes “the wearing of civilian clothing by members of the armed forces for purposes of disguise” as an example of a war crim
Bonus points because guess where I read that?
https://en.idi.org.il/media/6191/combatants_dressed_as_civilians.pdf
It seems like some things just don't change.
"See when I slap you in the face that's actually a really nice thing of me to do. Because if I don't slap you in the face I'd kick you in the groin really hard instead. Do you want to get kicked in the groin? No? That's what I thought."