A facinator is a headpiece (i.e. something you wear on your head) that is a style of hatmaking aka millinery.It is also often referred to as a cocktail hat. A "substantial facinator" refers to the size and bulk of the hat - as in, it's quite giant. A facinator is typically worn by women and affixed to the hair using a comb, hairpin or band to secure it in place. Material wise it can use feathers, beads, lace, tulle -pretty much anything for decoration.