815 ILCS 330/4
It shall be unlawful for any person, firm or corporation either individually or in any representative capacity, to carry for sale, sell or endeavor to sell any cotton duck or canvas as herein defined, or any articles other than clothing and wearing apparel composed or made in whole or in part of any cotton duck or canvas without having marked thereon the true and correct weight of said canvas, or cotton duck by ounces per yard, together with a description by name of any filler or other preparations placed in or on said cotton duck or canvas since its manufacture, or to misstate, misrepresent or conceal the true weight of said canvas or cotton duck by ounces per yard, or to misstate, misrepresent or conceal the existence of any filler or other preparation placed in or on said cotton duck or canvas since its manufacture.
815 ILCS 330/4