Damsel Hats
From My Little Wiki
These Damsel hats came with the First set of princess ponies. Damsel hats released in Europe tend to have a slightly different colour variation.
Came with Princess Tiffany
Came with Princess Sparkle
Came with Princess Starburst
Came with Princess Royal Blue
Came with Princess Serena
Came with Princess Primrose
Came with Princess Pearl
Came with the Dream Castle