Cotton yarn (other than sewing thread) put up for retail sale.

1. 1. For the purposes of subheadings 5209.42 and 5211.42, the expression "denim" means fabrics of yarns of different colours, of 3-thread or 4-thread twill, including broken twill, warp faced, the warp yarns of which are of one and the same colour and the weft yarns of which are unbleached, bleached, dyed grey or coloured a lighter shade of the colour of the warp yarns.