Dolkar is a beret or Rasta style hat with a brim. It is a based on a Himalayan (Ladahki) pattern, using a lacey leaf pattern and simple ribbing. You don’t have to stiffen the brim
If this hat reminds you of Angmo, you’re right. It’s the grown up version, using the same leafy lace pattern. That’s why it is named after Angmo’s mother Dolkar.