Tam o'Shanter

Tam o'Shanter (in the British military often abbreviated TOS or Tam) is a 19th-century nickname for the traditional Scottish bonnet worn by men. It is named after "Tam o'Shanter", the eponymous hero of the poem by Robert Burns, of 1790. It is the bonnet that was first worn throughout northwestern Europe during the 15th century. It is made of wool and has a toorie (pom-pom) in the centre. It also has as a main hallmark the clan tartan woven right into its woollen threads. This distinguishes it from other bonnets such as the beret. Although brimless, the Tam o'Shanter, like all Scots bonnets, has an external hatband.

Empath: The Luckiest Smurf stories
In the EMPATH: The Luckiest Smurf story series, Polaris Psyche wore that style of hat during Duncan and Brenda McSmurf's wedding.

Smurf Me Up!
In the Smurf Me Up! story series, Hendry Smurf wore that style of hat.