How to Make a 16×16 Pillow Cover? | Envelope Back Sewing

An envelope-style 16×16 pillow cover uses a single front panel and two overlapping back panels, and it takes about an hour to sew.

Making a 16×16 pillow cover is one of the most satisfying beginner sewing projects because the envelope back means no zippers or buttons to install. The overlapping fabric panels on the reverse side hold the pillow insert securely while still letting you pop it out for washing. The whole process comes down to cutting three rectangles, hemming two edges, and sewing one square seam.

What Size Fabric Do You Cut For A 16×16 Cover?

For the front panel, cut one square at either 16×16 inches for a snug fit or 17×17 inches for a looser look with room for seam allowance. The snug option works when you use a 1/4-inch seam allowance, while the larger panel suits a 1/2-inch seam and a fuller pillow form.

For the back, cut two rectangles. Each panel should be 16 inches wide by about 11 inches tall, placing them side by side to create the envelope opening with roughly 3 inches of overlap. The exact height depends on your seam allowance, but the two panels together must cover the 16-inch height plus the overlap minus the seam allowances.

Sewing The Envelope Pillow Cover Step By Step

Prewash, dry, and press your fabric before you measure or cut. This step prevents the finished cover from shrinking later and throwing off the fit on your insert. After pressing, follow this sequence:

1. Cut the front square to your chosen size, then cut the two back panels.
2. Hem one long edge of each back panel. Fold the edge under by 1/2 inch, press, then fold again and stitch close to the inner fold.
3. Layer the pieces with right sides together. Place the front panel on top, then position the two back panels underneath with the hemmed edges overlapping in the center.
4. Pin the outer edges together and sew around the full perimeter with a 1/2-inch seam allowance, backstitching at the start and end.
5. Clip the corners diagonally, close to the stitches without cutting them, to reduce bulk when you turn the cover.
6. Turn the cover right side out through the envelope opening and push the corners out fully from the inside.

Insert your pillow form and adjust the overlap so the opening sits flat. HelloSewing’s tutorial notes that a snug front panel with a smaller seam allowance gives a crisp, tailored look on a 16×16 form.

Common Mistakes And How To Avoid Them

Three errors cause most failed covers. Cutting the front panel too small leaves the insert straining the seams, while too large leaves it sliding around inside. Insufficient back overlap lets the pillow peek through the opening, so keep that overlap generous around 3 inches. Skipping the corner clipping also leaves bulky, blunt corners instead of sharp points.

For best results, finish your raw edges before assembling if you are worried about fraying. Pinking shears, zigzag stitching, or a serger all work on woven fabrics. The Willow Market’s pillow cover guide also suggests pressing the seams open before turning to reduce bulk along the edges.

If you would rather buy than sew, see our roundup of the best 16×16 throw pillow covers for tested options that skip the cutting table entirely.

Wunderlabel’s envelope pillow tutorial confirms the same method works for any square insert size, so adjust the numbers proportionally if you want a 14-inch or 18-inch version later.