Duck cloth

Fold a sample of duck cloth and it barely wants to bend — that stiffness is the point. Duck cloth is woven with two yarns treated as one in both directions and packed in tighter than standard canvas, which is what makes it feel so much denser than a lighter cotton at a comparable weight. Weight typically runs 8 to 15 oz — classic workwear duck sits around 12 oz — and the tight, low-nap weave gives it a smooth enough face to hold detailed embroidery despite being built for abuse.

Work jackets, chore coats, tool aprons, and carpenter pants lean on duck cloth specifically because it's expected to survive scraping against a truck bed or a job site rather than a gentle laundry cycle. Its tightness also means it resists fraying at a cut edge better than a looser canvas, which matters for sewn patches and applique panels.

Because duck cloth is thick and dense, embroidery needs a heavier needle and often a reduced stitch density to avoid a stiff, board-like patch of thread on top of an already-stiff fabric; screen printing works too, but the tight weave takes a hotter, longer flash to fully gel plastisol all the way through. Sewn-on tackle-twill or woven patches are common precisely because the fabric is sturdy enough to anchor heavy stitching without tearing.

People sometimes use canvas and duck cloth interchangeably, but duck is specifically the tighter, heavier, more tightly-woven end of the canvas family — not every canvas is duck, even though every duck is a canvas.