16 CFR § 300.23 - Linings, paddings, stiffening, trimmings and facings.
(a) In labeling or marking garments or articles of apparel which are wool products, the fiber content of any linings, paddings, stiffening, trimmings or facings of such garments or articles of apparel shall be given and shall be set forth separately and distinctly in the stamp, tag, label, or other mark of identification of the products.
(1) If such linings, trimmings or facings contain, purport to contain or are represented as containing wool, or recycled wool; or
(2) If such linings are metallically coated, or coated or laminated with any substance for warmth, or if such linings are composed of pile fabrics, or any fabrics incorporated for warmth or represented directly or by implication as being incorporated for warmth, which articles the Commission finds constitute a class of articles which is customarily accompanied by express or implied representations of fiber content; or
(3) If any express or implied representations of fiber content of any of such linings, paddings, stiffening, trimmings or facings are customarily made.
(b) In the case of garments which contain interlinings, the fiber content of such interlinings shall be set forth separately and distinctly as part of the required information on the stamp, tag, label, or other mark of identification of such garment. For purposes of this paragraph (b) the term interlining means any fabric or fibers incorporated into a garment or article of wearing apparel as a layer between an outershell and an inner lining.
(c) In the case of wool products which are not garments or articles of apparel, but which contain linings, paddings, stiffening, trimmings, or facings, the stamp, tag, label, or other mark of identification of the product shall show the fiber content of such linings, paddings, stiffening, trimmings or facings, set forth separately and distinctly in such stamp, tag, label, or other mark of identification.
(d) Wool products which are or have been manufactured for sale or sold for use as linings, interlinings, paddings, stiffening, trimmings or facings, but not contained in a garment, article of apparel, or other product, shall be labeled or marked with the required information as in the case of other wool products.