An article from Master Weaver No. 20 on weaving crepe fabrics, in which the whole cloth undulates, as distinct from 3D fabrics. It briefly covers mechanical and chemical crepe finishing, then describes weaving methods: same-direction yarn twist, alternating right- and left-hand twist yarns, differential warp tension, mixed linen and cotton warps, and tabby combined with satin or satinet. It gives a four-harness crepe draft with ten treadling variations and refers to multiharness crepe weaves from Oelsner. A short book note on Mary E. Black's Handweavers' Reference follows.