A beret pattern worked in a soft DK weight merino/angora blend using a traditional Shetland Lace pattern- Horseshoe lace.
"Bousta" means farm in old Norse. This pattern is available to purchase as a PDF download and includes charts for the lace and a photo tutorial of the Twisted German Cast On used in the pattern.
I rate this as an advanced beginner pattern.
Sample is in Sublime Yarns Angora Merino which is now discontinued. Suggested alternatives have been listed.