“Materials required - ROYAL SOCIETY White CORDICHET size 60, 5 balls. Crochet Hook, size 12.

This yoke is for size 36-38, if a larger size is desired add an inch for beading and edging for sleeve.
This yoke is made with 25 square medalions joined together.“

http://www.antiquepatternlibrary.org/pub/PDF/RoyalSocVol1...
Picture on pdf page 15, pattern on pdf page 16