Full canvas construction ★

What the canvas is

The canvas is an interlining, usually built in layers: a base of linen or wool, a chest piece of haircloth woven with horsehair, and often a soft felt domette over the top so the hair does not work through the cloth. It runs the full length of the jacket front, from shoulder to hem, and it is attached by stitching at the edges, floating free across the middle.

That freedom is the point. The canvas and the outer cloth are two separate layers that can shift against each other, so the jacket drapes rather than behaving like a board. A fused jacket, where an adhesive interlining is bonded to the cloth with heat and pressure, is one layer and behaves like one.

How it gets its shape

By hand, with pad stitching. Rows of small diagonal stitches are worked through the canvas while it is held in a curve over the maker's hand; each row tightens one layer relative to the other, so the canvas takes a permanent three-dimensional curve. The chest is shaped this way, and so is the lapel, which is why a well-made lapel rolls softly instead of creasing along a pressed line. This is slow. Pad-stitching a pair of lapels and a chest by hand is measured in hours, not minutes, and it is the single largest reason a canvassed coat costs what it does.

How to tell

The pinch test is the usual advice and it is only half reliable. Take the cloth of the front panel, below the buttonhole and away from the pocket, and pinch it between finger and thumb, then try to separate the outer cloth from the lining. If you can feel a third loose layer moving between them, there is a floating canvas there. If the cloth feels like a single stiff board, it is fused.

The unreliability is in the middle. A half-canvassed jacket will pass the test in the chest and fail it lower down, and some fusible interlinings are soft enough to feel convincing. If it matters, ask, and prefer a maker who answers precisely over one who says “fully hand-made”, which means nothing.