Webster's Revised Unabridged Dictionary · 1913

Glengarry

Glengarry , noun

[Name of a valley in Scotland.]

A kind of Highland Scotch cap for men, with straight sides and a hollow top sloping to the back, where it is parted and held together by ribbons or strings.
The long silk streamers of his Glengarry bonnet. — L. Hutton

Also: Glengarry bonnet