From the Knit Rowan website:
Knit this chunky pull on accessory hat from Warm & Toasty, a design by Gemma Atkinson using Tumble, a glorious lightweight, soft and lofty yarn (alpaca and cotton). With garter stitch detail, this knitting pattern is suitable for beginners.
To fit head circumference of an average woman.
Photographed in Pine Needle 571