I have 3 of these available all in remarkably good, probably never issued vintage condition.
I am not sure about the size since I dont really understand the dutch label (see pictures if you can understand them).
I think its a medium but here are my measurements:
Shoulders 17"
Length 31"
Sleeves
25.5"
Chest (under arm to under arm). 21"
I will ship fast and with care.