WHY CANVAS OVER FUSED

Firstly the canvas is designed to mould through wear giving the suit a better shape overtime. One of the reasons this is achieved is that the heat and moisture emitted from your body interact with the canvass to transfer the information (i.e. body contours)
Where as the use of fusing is primarily for its stiffening properties and it maintains no memory. The biggest disadvantage of utilising fusing is its hydrophobic nature which is necessary so moisture won’t break through and unstick the layers, but means on those hot days where you tend to sweat a little the it has no where to escape and is forced to sit on your skin; opposite of a canvas, which turns the moisture into beneficence.
The fusing is hydrophobic, water repellent; so on a hot day moisture won’t break inside and cause it to become unstuck. Therefore if the moisture can’t go through it is forced to sit on your skin. The fusing also effects the way the suit moves.. you can tell in the lines when you move and stretch that it looks different then the movement of a canvassed jacket. This property creating a slight flaw in a half canvasses suit; for the reason that the upper body will move differently to the lower body; though at least you do have the canvas in the most important section to get the right shaping.
Also because the canvas is tacked it can float, allowing it to position itself with the body whereas the fusing is stuck in its place.