PINCH TEST - Page 3
I agree. When I pinch tested my vintage sports coat, I actually was able to peel off the outer fabric from the front and back of the canvas which created that fabric separation sound. It was pretty addicting to listen. I actually started doing that on all of my sports coat just to hear that sound. lol
To correctly perform the pinch test, you have to be able to remove the outer fabric from the canvas and be able to rub the separated fabric against itself. It should feel like the fabric in the sleeves (minus the lining) when rubbed together. If there is something in between the fabric you pinched and you cannot easily separate the interloper, then that is fusing. If on the other hand, you can rub the fabric against itself, there is no fusing.
Half canvas is supposed to be glued on the bottom half and stitched on the top half. Don't have any pieces in front of me, but IIRC, the same rules apply and you can feel the fusing down at the bottom.