If there is a little give in it. Yes please. (44 chest).
Now I'm confused. I wear 16 1/2 for work. Could you pit to pit?
Militarymart does them. Should be easy enough to find in other places too. Search for m59 shirt.
EDIT: forgot to add last link: http://www.beredskapsboden.se/en/shirtssweaters/field-shirt-m59-new.html