One of the reasons that we use the interfacing known by the brand name "Hymo" among others is that it has some properties that canvas does not.
While canvas is strong and stiff at first, after a few washings it will be just as soft and flexible as any other.
And canvas is usually made from Cotton or Hemp which have been known to rot over time.
The interfacing recommended is primarily a synthetic. And is stiffer in one direction than the other. So we install it with the stiffness in the vertical direction. This gives body and rigidity to the back of the kilt. It will stand up all on its own.
We do not install the interfacing as a single piece but create folds that allow it to take the curved shape and further enhance the vertical stiffness.
We then use a broadcloth fabric that is strong and has no stretch for the stabilizer. This forms a belt built inside the kilt. The straps and buckles are sewn completely though the outer Tartan fabric and are anchored to the stabilizer.
Can you use canvas? Well yes, it has been used in other kilts and it can often be found in older military kilts.
But here is what canvas can look like if not cared for.
And the result if it does fail.
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