Beautiful 1950s piece made by old brand from Alsace, Koneco. Large size (24" pit to pit), buttons have had to be replaced, we have chosen red buttons. Dark blue workwear cotton twill. 
Classic cut with three patch pockets, five front buttons, one inner pocket. Small round collar typical of the era. Koneco label on the inside.
Made in Alsace  and 100% workwear twill cotton.