Jody, concerning seam-allowances or not, it’s rather easy: The cushions look best if the stuffing foam is slightly compressed. Thus, if you have the foam already in the correct size, cut the fabric to match the foam core size exactly. The resulting cushions will be look nice but a little smaller. If you start from scratch and need foam and fabric cut, you can add seam allowances so that the resulting cushion will fit exactly to the measures you took. Then the foam-core will be cut a little bigger to fit the fabric size exactly and not the measures you took. As far as I know, that’s also what’s in the videos by Sailrite.
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