If you want a little wiggle room for your cushion to move around on the bench, subtract an inch from the length. [2] X Research source
You want to use a blade with a serrated edge when cutting foam as it makes it easier to smoothly cut the foam particles. If you don’t have an electric knife, a serrated steak knife or turkey carver can also do the trick. There are many types of foams out there, ranging in density and thickness. We suggest using a 2 or 4 in (5. 1 or 10. 2 cm) thick foam for maximum comfort.
In the end, your pattern should look like an unfolded box. This step will help you get an exact pattern or guide. If patterns aren’t your thing, no worries! You can also cut out individual pieces of fabric for each side of the cushion. This works best if you’re making a cushion cover with a zipper or non-removable cover.
If you’re a sewing beginner, try outlining the seam allowance in a different color than the pattern. This will help you differentiate everything while sewing.
For example, if your foam is 11 by 7 inches (28 cm × 18 cm), the bottom piece of fabric should be 14 by 10 inches (36 cm × 25 cm).
When all corners are pinned, the fabric should look like a box without a lid. If you’re using fabric with a design, pay close attention to the print. Make sure the pattern or design matches at the seams before pining or sewing everything together. [10] X Expert Source Donna SerinoDry Cleaning & Alterations Specialist Expert Interview. 31 August 2021.
If your fabric frays, use a zig-zag stitch on the edges before starting the straight stitch. The stitching shouldn’t show when you’re finished, but you can still use a thread color that matches your fabric just in case.
If the foam doesn’t match up with the fabric, no worries! Create a smaller envelope with the fabric by pulling the pieces farther apart until the foam matches up.
If you’re using a patterned fabric, double-check that the design is or is close to matching up. [17] X Research source
