What a sew is and how to make one
A sew is a single stitch — the loop of thread that holds two pieces of fabric together. To make one, you push a needle through fabric from one side, pull the thread taut, and push back through from the other side. The thread forms a small loop on each side of the fabric. Repeat this motion and you build a seam. Most hand sewing uses one of three basic stitches: the running stitch (fastest, least strong), the backstitch (strongest, used for repairs), or the whip stitch (invisible, used for closing seams from the outside).
The difference between these stitches is the angle and direction of the needle. A running stitch goes straight through both layers in a line. A backstitch overlaps each new stitch with the previous one, creating a solid seam. A whip stitch runs the needle along the fold of fabric so the thread stays hidden. Which one you use depends on what you are joining and how much stress that seam will take.
Key Takeaways
- A sew is a single loop of thread through fabric; multiple sews in a line form a seam.
- The running stitch is fastest but weakest; the backstitch is strongest and best for repairs; the whip stitch is invisible and used for closing openings.
- You need a needle, thread, two pieces of fabric, and a way to mark where you want to stitch — a pencil, chalk, or a crease works.
- The needle should be small enough to pass through your fabric without leaving large holes, and the thread should match your fabric color or be invisible thread.
- Tension matters: pull the thread snug but not so tight that you pucker the fabric or break the thread.
What you need before you start
Gather a needle, thread, two pieces of fabric, and scissors. The needle size depends on your fabric — use a size 7 or 8 needle for lightweight cotton or linen, and a size 5 or 6 for heavier fabrics like denim or canvas. If you are new to sewing, a size 7 works for most everyday fabrics. Thread comes in many colors; match it to your fabric or use invisible thread if you want the stitch to disappear.
You also need a way to mark your stitch line. A fabric pencil, tailor's chalk, or a crease made by folding works. Do not use a regular pen or marker — the ink will bleed into the fabric or show through. If you are sewing a seam on two flat pieces, you can also use a ruler and measure a quarter-inch from the edge, which is the standard seam allowance for hand sewing.
A thimble is optional but useful if you are pushing the needle through thick fabric — it protects your finger from the needle point. Scissors should be sharp enough to cut thread cleanly; dull scissors fray the thread and make it harder to thread the needle.
Threading the needle and knotting the thread
Cut a length of thread about 18 to 24 inches long — longer than that and it tangles as you work. Wet the end slightly with your tongue or a damp finger to make it stiff, then push it through the eye of the needle. If the thread frays and won't go through, trim the end with scissors to make it sharp. Once the thread is through, pull it so one end is longer than the other — you will tie a knot in the longer end.
To tie a knot, wrap the long end of the thread around your index finger once, then roll it off your finger with your thumb. The thread forms a small loop. Pull the short end through the loop and tighten. You now have a knot at the end of the thread. This knot stops the thread from pulling all the way through the fabric when you start sewing.
Making a running stitch
The running stitch is the easiest to learn. Push the needle through both layers of fabric from the back, pulling until the knot catches on the underside. The needle should come out about a quarter-inch away from where it went in. Push the needle back through both layers, going in about a quarter-inch ahead of where it came out. Pull the thread snug — not tight enough to pucker the fabric, but tight enough that there is no slack.
Repeat: push through, pull out a quarter-inch away, push back in a quarter-inch ahead. Keep your stitches the same size and space them evenly. Uneven stitches look sloppy and are weaker. Work slowly at first — speed comes after you have made hundreds of stitches and your hands know the rhythm.
When you reach the end of your seam, push the needle to the back of the fabric and make two small stitches in the same spot, one on top of the other. This locks the thread so it will not unravel. Trim the thread close to the fabric.
Making a backstitch for strength
The backstitch is stronger than the running stitch because each new stitch overlaps the previous one. Push the needle through both layers from the back, pulling until the knot catches. Bring the needle out a quarter-inch ahead. Now push the needle back through the fabric at the point where the previous stitch ended — you are going backward, which is why it is called a backstitch.
Pull the thread snug. Push the needle forward through the fabric a quarter-inch ahead of where it just came out. You now have two stitches that overlap. Push the needle back to the end of the first stitch again. Repeat this pattern: forward a quarter-inch, back to the end of the last stitch, forward a quarter-inch, back again.
The backstitch creates a solid seam that will not split under stress, which is why it is the best choice for repairs or seams that take a lot of wear. Finish the same way as the running stitch: two small stitches in the same spot at the end, then trim.
Making a whip stitch to hide the thread
The whip stitch is used when you want the thread to be invisible — usually when closing an opening in a pillow, stuffed animal, or hem. It works only when you have a fold of fabric to hide the thread in. Fold the edge of the fabric inward so the raw edge is hidden, then press it flat with your fingers or an iron.
Push the needle through the fold of fabric on one side, running it inside the fold for about a quarter-inch. Push the needle out through the fold. Now push it straight across into the fold on the other piece of fabric, again running it inside the fold for a quarter-inch. Push the needle out. Pull the thread snug — the thread will disappear into the fold and the seam will look like a single line on the outside.
Repeat along the entire opening. The whip stitch is slower than the running stitch or backstitch, but the result is nearly invisible. Finish with two small stitches in the fold, then trim.
Common mistakes and how to avoid them
Uneven stitch length makes seams look sloppy and weak. Measure your quarter-inch spacing with your eye at first, then check your work by holding it up to the light. If the stitches are wildly different sizes, pull them out and start that section again. It is faster to redo a few stitches than to live with a weak seam.
Pulling the thread too tight puckers the fabric and can break the thread. The thread should be snug enough that there is no slack, but loose enough that you can slide your fingernail under it. If you see wrinkles in the fabric around your seam, you are pulling too hard.
Knotting the thread too close to the fabric leaves a lump that shows on the outside. Tie the knot at least a quarter-inch from the end of the thread. Similarly, do not trim the thread too close to the final stitches — leave a small tail so the knot does not slip through the fabric.
Frequently Asked Questions
What is the difference between hand sewing and machine sewing?
Hand sewing is slower but gives you complete control over stitch placement and tension. Machine sewing is faster and creates more uniform stitches, but requires a sewing machine and is harder to fix if you make a mistake. For small repairs, patches, or decorative work, hand sewing is often the better choice.
Can I use any thread for hand sewing?
Most thread works, but all-purpose polyester or cotton thread is best for beginners. Avoid thread that is very old or dry — it breaks easily. Invisible thread works for seams you want to hide, but it is harder to see while you are working and can be frustrating for beginners.
How do I fix a stitch if I make a mistake?
Pull the needle back out and gently tug the thread to loosen the stitches. Use the needle tip to pick at the thread and work it free. Once the thread is loose, pull it out completely. You can then re-thread the needle and start again from that point. Do not be afraid to redo stitches — it is a normal part of learning.
What fabric is easiest to practice sewing on?
Cotton or linen in a medium weight is ideal for practice. Avoid very thin fabrics like silk or very thick fabrics like canvas until you have made several seams. Medium-weight cotton lets you see your stitches clearly and does not require as much hand strength to push the needle through.
How tight should the knot be at the end of my seam?
The knot should be tight enough that it will not slip through the fabric, but not so tight that it distorts the thread or creates a visible lump. Make two small stitches in the same spot, then pull the thread snug before trimming. The stitches themselves hold the knot in place.