Part of a three-piece set - “Heart Pullover and Tights“ (Model 19)
The hat pattern is described here.
For the matching pullover, see Heart Pullover
For the matching tights, see Heart Tights

Yardage is not given for the hat.

Size
Head Circumference: 19 1/4 (19 1/4, 20 1/8, 20 7/8) inches