Epaulettes are fastened to the shoulder by a shoulder strap or "passant", a small strap parallel to the shoulder seam, and the button near the collar, or by laces on the underside of the epaulette passing through holes in the shoulder of the coat. Colloquially, any shoulder straps with marks are also called epaulettes. The placement of the epaulette, its color and the length and diameter of its bullion fringe are used to signify the wearer's rank. At the join of the fringe and the shoulderpiece is often a metal piece in the form of a crescent. Although originally worn in the field, epaulettes are now normally limited to dress or ceremonial uniforms.