Exodus 28:40

28:40 “For Aaron’s sons you are to make tunics, sashes, and headbands ¹  for glory and for beauty.

Exodus 39:28

39:28 and the turban of fine linen, the headbands of fine linen, and the undergarments of fine twisted linen.

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¹ sn This refers to a band of linen wrapped around the head, forming something like a brimless convex cap, resembling something like a half egg. It refers to the headgear of ordinary priests only (see S. R. Driver, Exodus, 310-11).