It's a reversible ponytail bucket hat.
|Back with regular snaps instead of the magnetic ones the pattern calls for.|
My purchased pattern is froFrom Winnie and Clem, and you can find it here: http://www.etsy.com/listing/104042408/pony-tail-bucket-hat-pdf-sewing-pattern
They also have a smaller size bucket ponytail hat pattern for sale.
As it turns out, there are numbers of ponytail hat patterns out there--winter, scrub, baseball, and bucket hats. Some are even free. Here are a few of the free ones:
Winter Hat/Scarf,Mitten, Fingerless Glove AND a pocket pattern: http://www.instructables.com/id/4-in-1-Hat-Scarf-Fingerless-Gloves-Mitten-Pock/
Cute Vintage Ponytail hat: http://blog.bramcostpublications.com/files/5/8/1/7/6/276039-267185/1149_pony_tail_hat_PDF.pdf
Blog tutorial to change a bucket hat to a ponytail hat: http://eatcraftsow.blogspot.com/2011/11/tutorial-wednesdaythe-ponytail-hat.html#.UZjOnZymX7M
If those don't work for you, here are a few patterns for sale:
Ponytail Scrub Hat: http://www.craftsy.com/pattern/sewing/accessory/ponytail-pouch-and-mens-scrub-hat-/25244
OR you can get All 7 of her Surgical Scrub Hat Patterns: http://www.etsy.com/uk/listing/121082965/all-seven-surgical-scrub-hat-sewing?ref=market
Winnie and Clem also have a Baseball-style Ponytail Hat Pattern for Girls and Women: http://www.etsy.com/listing/113008080/morgan-cap-pdf-sewing-pattern-reversible?ref=v1_other_1