Opening installment of a serial article on reversible double cloth structures from Posselt's Textile Journal. It defines pure and double-faced reversibles and their uses in trouserings, vestings, upholstery, coats and rugs. It then explains the 'double plain' 2-ply reversible with 4 dark and 4 light end stripes, using point-paper drawdowns (Figs. 1-3) and two methods of exchanging the plies: changing face/back thread placement, or changing the color dressing of the warp. Also includes a preview of topics for the series.