Laws for Selling Handmade Clothing & Accessories - Made Urban If your product contains a fibre in an amount of 5% or more by mass, it must be included on the label using its full generic name (i.e cotton, polyester, etc.) and the amount it is present in (i.e 40% wool & 60% cotton). If a fibre is present in an amount less than 5%, you must still mark it on the label but it may be identified as "other ...