It took me awhile to become comfortable enough with my sewing machine (and myself) to make substantial pieces on it. Envelope pillows are perhaps one of the best ways to become familiar with sewing because it really requires you to think like a sewer. Sounds a little obvious, right? But you probably know what I mean if you’ve tried it. Here’s how I do it:The first step is to choose a fabric. I chose two contrasting fabrics to make it a little easier to explain. It also creates a more interesting and versatile pillow, in my opinion. Next you'll want to cut the fabric. There will essentially be two pieces you'll need to cut (the front piece and the back piece). The front piece will be about 1 full inch bigger than your pillow. So, if you have a pillow that measures 12" x 12", you'll want the front piece of fabric to measure 13" x 13". And if you have one that is 12" x 18", you'll want the front piece to measure 13" x 19", and so on.
Now the back piece is a little different. This will be the exact same width as your front piece, but the length will be 4" longer than the length of the front piece. This will provide enough room for the overlapping, or "envelope" part of the pillow. You will then want to take that back piece of fabric and fold in directly in half and cut it down the middle. Remember to fold & cut it hamburger style, not hotdog style. Flip the fabric so that the backside is facing up and then fold the inner ends. Then pin and sew them into place. After sewing the outside edges of the two back pieces, place them facing down on top of the upward-facing front piece. Pin the edges and sew everything in place. After sewing, turn the pillow cover right-side out and you're done!