So this post is only about a year late, right? I made my daughters' doll beds back last December for Christmas, and I am just now getting to the mattress tutorial. Lazy much? ;)
Without further ado, here's the tutorial. And it can be adapted to make any kind of boxed cushions for benches, etc. I'll describe how to measure for other sizes in the tutorial. Enjoy!
- Corrugated mattress topper - I bought this full-size topper at Wal-mart for about $10, and you can see how much I needed to make two full cushions...it'll last awhile! Ha! It's still so much cheaper than buying the foam padding from the craft stores. That stuff is outrageous!
- Fabric - 1/2 yard (at least 45" wide) fabric of your choice
- Batting (optional - I did not use it on the doll bed, but if you're doing cushions for a couch or chair, it would be recommended)
The hot glue isn't a perfect hold, and you'll have to do one section at a time since it will dry really fast. but it will keep them together until you get them in the casing, and then it doesn't really matter much at that point!
STEP 2: Measure around your padding both width-wise and length-wise. Divide each number in half and then add one inch to each (for a 1/2" seam allowance on either side). That will tell you how wide and long to cut your pieces.
My mattress was 23" around width-wise and 40" around length-wise, so I needed to cut my two pieces each 12.5" x 21". Make sense?
STEP 3: Once you have your two pieces, place right sides together, and sew around the edges with 1/2" seam allowance. On one of the long sides, leave a large portion open, so you can fit your mattress in there.
STEPS 4 and 5: Pinch each of the corners and separate them. Then iron down along the seams, so they're nice and open.
STEP 6: Measure how tall your mattress or padding is. Mine was 2" tall. Then place a pin or mark on your fabric where it is 2" across in width (or however tall your padding ends up being, go to that measurement). Then sew along that line and trim off that extra little triangle.
STEP 7: Turn it right-side-out, and it should look like this. As you can see from mine, I measured wrong the first time! Good thing I didn't trim it off before checking to make sure it fit! ;)
STEP 8: Roll up your mattress slightly and squeeze into the casing.
It should look like this once it's in.
STEP 9: This step will mostly depend on how polished you want your cushion to be. If you wanted a really professional finish and plan to remove the casing to wash (like for chair cushions), I'd recommend removing the padding and sewing in a zipper. If you don't care much about washing it, you can stitch it closed by hand with a blind stitch, and that will give it a nice, even finish.
Or you can be lazy like me and just move the padding over a tiny bit, pinning the edge, and then sewing it closed with your sewing machine! Ha!
It's not the prettiest finish (especially here with my seam that had to be unpicked), but for a doll bed, I wasn't going to mess with either of the other two options.
Be sure to visit my PROJECTS page to see links to the doll beds and other bedding and pillow tutorials I have!