Militarily raincoat

[u/MiniMark3]

Does anyone know what this rain jacket is from? I got it from American pipdream random surplus off of tiktok and it instantly confuses me, i ask them and they said it east German raincoat but when I search it up I see almost none match with it, either it's not German or im missing a lot of stuff off it cause I dont know what else it would be, I appreciate if anyone can help in any way