Sew a fitted cushion cover by hand

WHAT YOU WILL BE ABLE TO DO

Make a washable cover for a small square indoor throw cushion and explain its seam allowance and back-panel overlap.

A cushion cover is a real construction project: you decide the finished size, allow for joins, orient the fabric and make an opening that lets the insert come out for washing. The envelope back uses overlapping panels, so it needs no zipper. Hand sewing takes longer than machine sewing; allow several short sessions and judge the result by fit and durability rather than speed.

THE METHOD

Step by step

1. 01

   Choose the finished size and make the arithmetic visible

   Measure the empty insert seam to seam rather than wrapping the tape around its bulge. For a 40 cm square insert, this example aims for a 40 cm finished cover with a 1 cm seam allowance on each outside edge. The front therefore measures 42 × 42 cm. Choose a 10 cm back overlap. Each back's cut height is half of finished height plus overlap, then two 1 cm hem folds and one 1 cm outside seam allowance: (40 + 10) ÷ 2 + 2 + 1 = 28 cm. Its width is 42 cm.

2. 02

   Check fabric direction and trial the fit before committing

   Use the prewashed cloth so later shrinkage is less of a surprise. Mark panels with edges following the woven grain, keeping a directional print upright if you use one. Draw the 1 cm outside seam lines. If fit is uncertain, use inexpensive similar cloth and long removable stitches to make a trial. A very firm or bulky insert can need a different finished size; calculate again rather than stretching a too-small cover until the seams strain.

3. 03

   Hem the two opening edges

   On each back rectangle, choose one 42 cm edge as the opening edge. Fold it toward the fabric's wrong side by 1 cm, then fold another 1 cm so the raw edge is enclosed. Clip, finger-press or iron as the care label permits, then thread the needle with about 45 cm of single thread, knot its long end and sew near the inner fold with small relaxed running stitches. Each panel is now 42 × 26 cm. Check the hems stay straight; pulling the thread tight enough to gather the edge makes the envelope gape.

4. 04

   Arrange the envelope with the outer faces together

   Lay the front right side up. Lay one back right side down, matching its unhemmed edge to the front's top edge and the side edges together. Place the other back right side down with its unhemmed edge at the bottom. The finished hems overlap in the middle by 26 + 26 − 42 = 10 cm. Clip the entire perimeter and check all intended layers meet at the overlap. Keep both central hems free: the opening is not sewn shut.

5. 05

   Join the outside on its marked line

   Practice backstitch on scrap first. Mark points A, B and C along the seam, each 3 mm apart. Bring the needle up through both layers at A, insert it 3 mm behind A and bring it up at B. Now insert at A and emerge at C. Next insert at B and emerge 3 mm ahead of C. Continue by returning to the preceding visible stitch's endpoint, then emerging at a new point 3 mm ahead of the current up-hole. Each front stitch fills the next 3 mm gap. Sew around the cover 1 cm from the raw edges, turning at the marked corners. At starts and ends, make a tiny stitch and pass the needle through its thread loop before tightening; repeat to secure. Check tension and both layers regularly, especially where three layers overlap.

6. 06

   Contain the raw edges and reduce corner bulk

   Before turning, finish the exposed seam allowances with small overcast stitches: loop thread diagonally over the raw edge and through both allowances, repeating without cinching them into a cord. Test this on scrap. If a corner is bulky, snip only its excess tip outside the seam, leaving several millimeters of fabric clear of the stitching. Do not cut the joining thread. A slightly rounded sound corner is better than a sharp corner weakened by cutting too close.

7. 07

   Turn, insert and judge the whole cover

   Turn right side out through the overlap and ease corners with your fingers, never a sharp tool. Account for every clip and needle. Fold the insert gently to pass it through the envelope, then settle it into the corners. Check the front lies evenly, the opening remains overlapped and the seams are relaxed. Remove the insert to inspect a strained stitch. After washing according to the fabric label, inspect raw-edge security and fit again before calling the project durable.

SEE IT IN PRACTICE

If it does not go to plan

Seam allowances are counted as usable cover space

The two 1 cm joins reduce a 42 cm front to 40 cm between stitch lines. Calculate the finished dimension first.

The central opening is stitched closed

Join the perimeter while leaving the hemmed overlap free. Turn and remove the insert through that opening.

Tiny stitches are pulled into gathers

Regular relaxed tension matters more than force. Check the fabric lies flat after each short section.

BUILD THE SKILL

A little more capable each time

1. First attempt

   Make a scrap envelope sample with two hemmed edges and a backstitched corner. Turn it and inspect both the opening and raw-edge finish.

2. Use it for real

   Construct the stated cover or recalculate for your insert. Check the panel sizes and overlap with a ruler before perimeter sewing.

3. Take it further

   Use and wash the cover according to its fabric label. Make a second cover improving one observed fit, tension or seam-finish issue.

CHECK YOUR LEARNING

Can you do it?

Judge the result against these signs. If one is missing, return to the relevant step and try again.

• The dimensions between seam lines match the chosen finished size.
• The back has a measured overlap and the insert can be removed without cutting stitches.
• The outside lies evenly and seams show no open gaps, gathers or strain.
• Raw edges are contained and all sharp tools are accounted for.

Explain it to yourself

Try answering before opening the explanation.