Full Zip, 3 Snap Pocket Smock:
1956 date. Extremely heavy, rigid, treated poplin fabric. Tail snaps to inside of back.
Denison Style Smock:
1955 date, twill material. Similar straight pocket layout to 1949 Version. Riri zipper, snaps are unbranded. Zipper is closer to 3/4 length, does not reach bottom. Tail snaps to outside of back.
Same material as full zip smock.
Same material as full zip smock and trousers but less treated so not as rigid. Wool liner material is similar to wool US WW2 era shirt material.