capstring

plural capstrings

1. plural normallyA string that fastens a cap on the wearer's head.

   By this well-managed ruse he came into possession of a scarlet breast-knot from Mrs. Dashwood; a black crape capstring from Mrs. Faithful; a smelling bottle from Juliet; and a pencil-case from Blanche[…]

   1840, Theodore Edward Hook, Cousin Geoffrey, the Old Bachelor, page 129

   1 more example

   He had scarcely finished the sentence when the door opened, and in rushed Toppin's wife, making such havoc of her capstrings, which she pulled and twisted in her excitement, that one might have been induced to suppose they were anything but minor objects of her wrath.

   1867, Benjamin Brierley, Marlocks of Merriton, page 101