This is hat part of pattern Dress and Hat in Crochet.
Shown in Color on Front Cover.
Page 6.

“A medium-weight, all-purpose crochet cotton was used for model. It takes about 300 yards. Use a steel crochet hook size 00 or size required to obtain given gauge. An adjustable tie at base of crown, teen-age to adult (22 1/2) size.”