The lapel is the second clue. On a canvassed jacket, the lapel rolls in a soft curve from the collar down to the button, with no sharp pressed fold. It's a detail people notice up close, including in photos from talks and family celebrations.
Over time, the canvas and the wool take on the shape of your chest, so a well-chosen jacket sits even more naturally after a period of wear than on the day you bought it. A fully fused front adapts to your body far less.
Then there's comfort in a warm room. A sewn-in canvas doesn't add a continuous layer of adhesive across the front, so the jacket can feel more pleasant over a long day. It's a difference in feel, not a thermal miracle: the weight of the cloth and the lining matter more. That's why the lining composition is worth checking too; we explain what a cupro lining brings in a separate guide.