How to Make a 16×16 Pillow Cover | Envelope Closure Method

Sew a 16×16 pillow cover with an envelope back using two overlapping panels — no zipper or buttons required.

Making a 16×16 pillow cover is one of the easiest beginner sewing projects, and the envelope closure method means you skip zippers entirely. You cut a front square, two overlapping back panels, hem the inner edges, and sew everything together around the perimeter.

What You Need Before You Start

Gather your materials first so cutting and sewing flow without interruptions. You’ll need about half a yard of fabric for a standard 16×16 cover, matching thread, scissors or a rotary cutter, straight pins, and an iron. A sewing machine makes the project faster, but the envelope method works hand-stitched too — just budget extra time for the seams.

Wash and press your fabric before measuring. Fabric shrinks on the first wash, and skipping this step means your finished cover might not fit the pillow form the way you expected. Iron everything flat so your measurements are accurate.

Cut the Front and Back Panels

The front panel is one square, and the back is two rectangles that overlap to create the envelope opening. Here are the cut sizes that work for a 16×16 pillow form:

Measure your actual pillow form first; inserts vary slightly, and the right fit depends on how plump you want the finished cover.

Sew the Envelope Back and Assemble

Hem the inner edge of each back panel first. Fold the raw edge under about 1/4 inch, press with an iron, then fold again another 1/4 inch and press. Stitch close to the inner fold — this double-fold hem keeps the fabric from fraying and gives the back opening a clean finish.

Lay the front panel right side up, then place the back panels right side down on top of it. Position the top panel so its hemmed edge faces the center, then place the bottom panel with its hemmed edge also facing the center, overlapping the first panel by at least 2-3 inches. Pin everything in place around the perimeter.

Sew around all four sides with a 1/2-inch seam allowance, backstitching at the start and finish to lock the stitches. Trim the corners diagonally — close to the stitching but not through it — so the corners turn out sharp instead of bulky. Reach through the envelope opening, turn the cover right side out, and push the corners out gently with a blunt tool or your fingers. Press the seams flat, insert your 16×16 pillow form through the back opening, and fluff it into place.

If the back panels barely meet, the pillow form peeks through the gap. If you’re shopping for a premade option instead, our roundup of best 16 pillow covers compares top-rated picks for every budget.

Common Mistakes and How to Avoid Them

Skipping the prewash tops the list — fabric shrinks and distorts after the first wash, so measure after pressing, not before. Second is the overlap problem mentioned above; fix it by cutting your back panels larger than you think you need.

Weak seams are the third issue. A 1/2-inch seam allowance with backstitching at both ends keeps the cover together through regular use and washing.