Pattern notes: “Those of our soldiers who have experienced discomfort in wearing a helmet on account of the tightness around the opening for the face will commend this style.
The purling gives a snug fitting but elastic opening that will not bind.”

Corticelli Knitola Fingering Yarn 4oz (2 balls)
Oxford No. 69

Four No. 5 double point bone knitting needles

The pattern is on page 57 of the booklet