I don’t think anyone will argue with the suggestion that Dorothy Gish pretty much walked away with Hearts of the World. Her Little Disturber was a sassy little number who wore a signature Tam o’ Shanter. The tam was a popular headgear choice for fashionable young ladies and had a jaunty flavor that went very well with Dorothy’s character.
Surely you want one of your own. Well, you can have one if you have some yarn and a crochet hook. This pattern is from the Sunlight Book of Knitting and Crochet, a 1915 publication. I am not positive about yarn weights but I believe that dk or sport weight should work. If crochet hook numbers are the same, the no. 5 should be an F hook. No guarantees, I have not tried this pattern myself.
(The model is not Dorothy Gish but I think there’s a resemblance.)
Remember that young ladies in this era often had a lot of hair done up in curls. Therefore, hats tended to be on a grander scale during this period. Women with less… luxuriant hair, either shorter or straighter, will want to keep this in mind when making the tam. Of course, if you are blessed with thick or naturally curly hair, the tam should look smashing as-is.