The Basic Stitch for Joining Fabric

The running stitch is the fastest way to join two pieces of fabric by hand. Thread a needle, knot the end, and push it through both layers of fabric from back to front about one-quarter inch from the edge. Push the needle back through both layers a quarter inch away, then forward again a quarter inch further along. Keep the stitches small and even — the smaller they are, the stronger the seam. Continue this forward-and-back motion along the entire edge you want to join.

For seams that will take stress — like the sides of a bag or the armholes of a garment — the backstitch is stronger. Push the needle through both layers from back to front, then push it backward through the fabric about one-eighth inch, and bring it forward again one-eighth inch ahead of where you started. The needle always comes out ahead of where it went in, and goes back into the hole the previous stitch made. This creates an overlapping line of thread on the back and a solid seam on the front.

Key Takeaways

  • The running stitch works for most hand-sewn seams and is faster than the backstitch, though slightly less durable.
  • The backstitch creates a stronger seam by overlapping each stitch and is the better choice for garments or bags that will be worn or carried.
  • Keep stitches small and even — quarter-inch spacing for running stitch, one-eighth inch for backstitch — so the seam holds without gaps.
  • Always start with a knot at the end of your thread and finish by making several small stitches in the same spot to lock the thread.
  • Pinning or basting the two pieces together before you sew prevents them from shifting and keeps your seam straight.

Preparing Your Fabric and Thread

Before you sew, pin the two pieces of fabric together with the sides you want to show facing outward — this is called right sides together. Place pins perpendicular to the edge you will sew, spacing them about two inches apart. If you are joining pieces that are slippery or hard to control, baste them first: use a longer running stitch with a contrasting thread color, sewing about half an inch from the edge. This temporary seam holds the pieces steady while you sew the real seam closer to the edge.

Use a thread color that matches your fabric, or use a neutral color like gray or tan if an exact match is not available. A single strand of thread works for lightweight fabrics like cotton or linen. For heavier fabrics like denim or canvas, use two strands — thread your needle, pull the thread so both ends are even, and knot both ends together. Thicker thread is stronger but harder to push through dense fabric, so test on a scrap first.

Starting and Finishing Your Seam

Tie a knot at the end of your thread by wrapping the thread around your index finger, rolling it off with your thumb to form a loop, and pulling the loop tight. Push the needle through the back layer of fabric only, about half an inch away from where you want to start sewing. Bring the needle forward through both layers at your starting point — the knot will catch on the back layer and stay hidden. This hides the knot inside the seam.

When you reach the end of the seam, make three or four small stitches in the same spot, pushing the needle through both layers each time. This locks the thread so it will not unravel. Trim the thread close to the fabric. If you basted the seam with a contrasting thread, carefully pull out the basting thread now — it should come free in one long strand.

Keeping Your Seam Straight and Even

The edge of the fabric is your guide. Place your needle about one-quarter inch in from the edge for a running stitch, or one-eighth inch for a backstitch. Use the edge of the fabric as a visual reference and try to keep the same distance all the way along. If your seam starts to drift, stop and look at where the edge is, then adjust your next stitch to get back on track.

For long seams, mark a line with tailor's chalk or a fabric pencil before you start. Fold the fabric in half lengthwise, mark the fold with chalk, then unfold it. Sew along this line instead of eyeballing the distance from the edge. This takes longer but produces a much straighter seam, especially on garments where the seam will be visible.

Choosing Between Running Stitch and Backstitch

Use the running stitch for seams that do not take much stress: joining fabric pieces for quilts, attaching appliqués, or sewing decorative seams. It is fast and uses less thread. The downside is that if one stitch breaks, the seam can unravel quickly because each stitch is independent.

Use the backstitch for seams that will be worn or stressed: the sides of a bag, the seams of a garment, or any seam that needs to hold weight or movement. It is slower and uses more thread, but if one stitch breaks, the overlapping stitches on either side hold the seam together. For a garment you plan to wear more than a few times, backstitch is worth the extra time.

Common Mistakes and How to Avoid Them

Stitches that are too large create gaps where the seam can tear or fray. If you are new to hand sewing, aim for stitches no larger than one-quarter inch. Stitches that are uneven in size look sloppy and are weaker where the gaps are larger. Slow down and focus on keeping the spacing consistent — it matters more than speed.

Pulling the thread too tight as you sew can pucker the fabric and make the seam curl. Pull just hard enough so the thread sits flat against the fabric without slack. If you see puckering, you are pulling too hard; loosen your grip slightly on the next few stitches. Knotting the thread too close to the needle makes it hard to push through fabric; leave at least six inches of thread between the needle and the knot.

Frequently Asked Questions

What kind of needle should I use?

A size 7 or 8 hand-sewing needle works for most cotton and linen fabrics. Finer fabrics like silk need a smaller needle (size 9 or 10), and heavier fabrics like denim need a larger needle (size 5 or 6). The needle should slide through the fabric with gentle pressure — if you have to force it, the needle is too small for that fabric.

Can I sew two pieces of fabric together without pinning them first?

You can, but pinning prevents the pieces from shifting and keeps your seam straight. If you skip pinning, hold the fabric pieces firmly in your non-sewing hand and sew slowly. For beginners, pinning saves time overall because you will not have to rip out and redo crooked seams.

How do I fix a seam if I make a mistake?

Use a seam ripper or small scissors to cut the thread every few stitches, then pull the thread out. Pick out any remaining thread with tweezers. If only a few stitches are wrong, you can leave them and sew over them with new stitches, but this creates bulk. For a clean repair, remove the bad stitches and resew that section.

What thread weight should I use for heavy fabric?

Use two strands of regular thread for most heavy fabrics, or switch to upholstery thread or buttonhole thread, which are thicker and stronger. Test on a scrap of your fabric first — if the needle does not push through easily, the thread is too thick for hand sewing that fabric.

Do I need to finish the raw edges after I sew the seam?

Not for most projects. If the fabric frays badly or will be washed frequently, you can trim the raw edges with pinking shears (which cut a zigzag pattern) or fold them over and sew them down with a whip stitch. For quilts and bags, raw edges are usually fine as long as the seam itself is strong.