Vintage, Givency Intimates Paris, medium sized full length nightgown. It does have a little bit of “something“ on one of the sleeves. (See picture) I’m sure it could be gently wiped with a baby wipe. It is very soft material with lace trim on the sleeves and the bottom.
It is a peach color. Please see all pictures for the measurements and part of the description. Ask any questions if needed before purchasing.