Definition of "hatband"

Ye cast skin of an Addar is an excellent remedie to draw out a Thorne, out of ones flesh. The Sussexians doe weare them for Hatt-bands, wch they say doe preserve them from the gripeing of the Gutts

1687, John Aubrey, Remaines of Gentilisme and Judaisme, page 38

Popping in crimson, yellow, blue and white and tricked out with crystals, feathers and hatbands made of crocodile or contrasting ribbon, today’s fedoras would look at home on any villain in a ’70s Pam Grier movie — but executed with more finesse, and with a price tag to match — from $300 to $1,500.

2007 January 18, David Colman, “Old Hat? Not on a Young Head”, in New York Times‎