Black Bombtwill behaved so differently from the other colours that Outlier gave it its own name, Postdenim. Each yarn twists hundreds of crimped nylon filaments, over 200 in the warp and over 300 in the weft, with elastane in the weft for freedom rather than stretch. The fabric doesn’t fade, and the Deux cut is boxy and relaxed. Sizes 28 to 38, $350.