Here's a summary of what we know of what was used on the original suits, courtesy of the images and information provided by Voice In The Crowd:
Snaps
The shoulder strap snap fasteners (poppers) are Newey size 10. Gallery
The other snaps all over the suit are Newey size 5 tops with size 4 studs. Known as a 5/4 configuration.
The shin hooks are Newey size 4 Gallery
Elastics
Thigh elastic is 75mm wide and is 46 cord. Length 230mm total. 200mm long with a 30mm fold over. There is