Hopsack

Hopsack is the basket weave gone to tailoring: yarns interlaced two-and-two or more, giving an open, breathable cloth with a visible checkerboard grain. The name remembers the sacking that carried hops to the breweries, but the modern cloth is the unstructured summer jacket of menswear, prized because its open weave sheds wrinkles and moves air while still reading as suiting at a distance. The trade-off is snagging: those long floats catch on rough edges, which is why hopsack is a jacket cloth and rarely a trouser.