Hi Nancy, I am not sure I can be of much help. Turn the material right side out and press the seam flat again. Think about your project and how much excess fabric you will need here! ... That French seam is a good idea. In my sample project, the item I am covering is 6″ high (B). I'd like to receive the free email course. Match bottom and side seam, pin and sew down with desired seam allowance (1/4″ should be fine). To sew a French seam, start by pinning the fabric with the wrong sides facing each other and sewing it together using a 1/4 inch seam allowance. Sneak peek: Once you master how to sew boxed corners, I swear your eyes will be opened to potential projects all over your home! Again, once turned right-side out, you’ll end up with a lovely boxed corner seam! It looked beautiful, but the whole time I was sewing, I knew I hadn’t allowed for the 1/2″ seam allowance. I suspect that the method mentioned in the instructions usually works due to the flexibility of the foam and a slight stretch in the fabric. First, cut the upholstery foam to the desired size. My best suggestion would be to try it without the subtraction (my original equation didn’t include the subtracted seam allowance). And since it’s going to be washed a ton, I chose to use Method 2 which enclosed the raw fabric edge into the seam. Hi Darlene, It’s not just about determining if you have enough fabric. For this method, you’ll want to make sure you’re RIGHT sides are together and the top and sides line up perfectly. Could this be configured to have different cut outs on the corners to accommodate the shorter drop /height in the back? Sew a full 1/4 inch seam (or half inch if that is what you are doing). Either way, it is no longer fully finished and is begging for a lining. The instructions say they should be B+C by B+C, but because of a 1/2″ seam allowance (a concept that was hard for him to understand), the formula had to be (for 1/2″ seam allowance; adjust accordingly if you use a different allowance). Wrong sizes and failed instructions. Don’t just cut the extra 1″ seam allowance, cut and extra inch of both sides (3″ total) so you have lots to bunch up. I stood by my original instructions for a long time, but after getting several emails that the equation was wrong, I practiced again with the adjusted equation and determined the subtraction element was correct. My material was not stretchy, plus I had made the frame myself years ago, and it had some hard wooden corners that were only covered with batting. You get the exact same finishas above, just in a different way. THANKS! This seam allowance is for the surface of the cover (rather than the hem), so subtract it no matter the length of hem you use. I am making a tablecloth for a friend, and she mentioned a boxed corner. Will practice on some cheap material next time. A few project on Crazy Little Projects involve box corners. cut the corner The steps here require you to cut a little box totally out of the corner. Next, you will need to determine how much fabric to cut away in order to make a perfectly-fitting corner seam. I’ve been wanting to know how to do this for a long time. Then, grasp the fabric on both sides of the corner. I’ll show you what all I made on Thursday, but today I wanted to pop in with another installment of my Home Decor Sewing School series. Is there a simpler way to explain that step? Push out the corners with something that has a blunt tip, like a knitting needle or chop stick. Measure, mark, and then cut squares … Would you please do a post about 101 keeping care of your sewing machine? Turn bag right side out and push the corners out. They are often used in high-end garment construction, as well as in making pillow or duvet covers -- they can make the seam of any sewing project appear neat and tidy. With your square of fabric cut away, it’s time to sew up your corners! I was wondering how to make the perfect fitted crib sheet with the elastics underneath them to hold those cornes, your link shows about the crib skirt. Is it possible to use this method if you are covering a boxed foam shape ie. Go back and sew the seam again, this time with RIGHT sides together but again using a 1/4″ seam allowance.