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In page Tam o' shanter (cap):

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Similar in outline to the various types of flat bonnet common in northwestern Europe during the 16th century, the later tam o' shanter is distinguished by the woollen ball or toorie decorating the centre of the crown; the name itself did not enter common usage until the early 19th century, subsequent to the popularity of Burns' poem.[3] The term came to denote a hat, usually associated with Scottish military regiments, derived from the old bonnet,[4] along with the Glengarry and the Balmoral bonnets. The Balmoral was sometimes simply described as synonymous with the tam o' shanter.[5]