This is the Side Slip Cloche by Laura Irwin, available in the book Boutique Knits.
There are two versions of this hat, one in blue Austermann Natura and
one in green and light blue Artyarns Silk Rhapsody Glitter. This
popular pattern is wonderful—the design is so cute and it looks great
on round, oval, and heart-shaped faces. This one was a favorite for all