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I don't know where the clean jumpsuit is i don't even know if you can get one but the dirty Chinese jumpsuit can be found in rivet city bannon should be selling one sorry i couldn't be more helpful.

The only “Clean” Chinese jumpsuits in the game are worn by Chinese Commandos when the Failsafe Terminal is activated during the Tranquility Lane quest. It can not be looted from their bodies, as they will merely get rendered unconscious when killed.

The dirty Chinese jumpsuits can be bought from many vendors or looted off of the Chinese solders the Taft Tunnels under the Jefferson Memorial, and found on Chinese Remnants at Mama Dolce's.