A bi-functional collar guard includes two elongated narrow parts and a wide part disposed between the elongated narrow parts, wherein the bi-functional collar guard removably outfits a neckline of clothing by placing a folded part inside the clothing and thereby aligning an upper part of the bi-functional collar guard substantially parallel to an outer part of the neckline such that a fold line of the bi-functional collar guard coincides with the outer part of the neckline.