What gathering stitches do and when to use them
A gathering stitch is a row of loose stitches that bunches fabric into tight folds when you pull the thread. You use it to shrink a long edge of fabric down to fit a shorter edge — the most common example is gathering the top of a skirt waistband or the sleeve cap of a fitted garment. The stitch itself is just a straightforward running stitch made with a longer-than-normal stitch length, so the thread sits loose enough to slide and bunch the fabric without breaking.
Gathering works on any woven or knit fabric, though lighter fabrics bunch more evenly than heavy ones. You typically sew two parallel rows of gathering stitches about a quarter-inch apart, so you have a backup thread if one breaks while you are pulling. Once the fabric is bunched to the right width, you sew over the gathering with a permanent seam that locks it in place.
Key Takeaways
- Gathering stitches are long running stitches sewn with loose tension so the thread can slide and bunch the fabric when pulled.
- Sew two parallel rows of gathering stitches about a quarter-inch apart to avoid losing all your work if one thread breaks.
- By hand, use a needle, thread, and a running stitch with stitches about one-quarter inch long; by machine, lengthen your stitch to 4.0 or 5.0 mm and reduce tension slightly.
- Pull the bobbin thread (the bottom thread on a machine) rather than the top thread, because it slides more easily through the fabric.
- Once the fabric is bunched to the right width, sew a permanent seam over the gathering stitches to lock the folds in place.
Hand-sewn gathering stitches: the running stitch method
Thread a needle with a length of thread about 18 inches long — longer threads tangle and break more easily when you pull them. Knot one end. Starting at the left edge of the fabric you want to gather, push the needle through from the back, about a quarter-inch from the edge. This knot will stay on the back side and anchor your thread.
Make a straightforward running stitch along the line where you want to gather, pushing the needle in and out of the fabric in one motion. Keep each stitch about a quarter-inch long — longer stitches bunch unevenly, and shorter stitches are harder to pull without breaking the thread. Sew all the way across to the right edge, then push the needle through to the back and make a small stitch to find the thread, but do not knot it yet.
Sew a second row of gathering stitches about a quarter-inch below the first row, using the same stitch length and the same start-and-stop method. When you reach the right edge, find the thread but do not knot it. Now you have two parallel lines of loose thread on the back of the fabric, ready to pull.
Machine-sewn gathering stitches: settings and technique
Set your machine stitch length to 4.0 or 5.0 mm — this is roughly twice the length of a normal seam stitch. Leave the tension at normal or reduce it slightly so the thread sits loose in the fabric. Use a standard presser foot and regular thread in a color that matches your fabric or blends in.
Sew a line of stitches along the edge you want to gather, starting and ending about half an inch from the fabric edge. Leave the thread tails long — at least 4 inches — so you have something to grip when you pull. Sew a second row of stitches a quarter-inch below the first, again leaving long thread tails at both ends.
Do not backstitch at the beginning or end of gathering rows. Backstitching locks the thread in place, which makes it impossible to pull and bunch the fabric. Instead, straightforward lift the presser foot and pull the fabric away from the needle when you reach the end.
Pulling the threads to bunch the fabric
Lay the fabric flat on a table with the gathering stitches facing up. Gently pull one of the bobbin threads (the bottom thread) at the right end of the first row. The fabric will begin to bunch toward the left. Pull slowly and evenly — jerking the thread can break it, especially on delicate fabrics.
Keep pulling until the bunched fabric is roughly the width you need. You do not have to match the exact width yet; you will fine-tune it in the next step. Once the first row is bunched, pull the bobbin thread of the second row the same way. The two rows work together to hold the gathers in place and prevent them from sliding out of line.
Distribute the gathers evenly across the width by sliding the bunched fabric along the threads. Push the folds toward the center if they are crowding one end, or spread them out if they are bunching too tightly in one spot. This takes a minute or two but makes the finished seam look much neater.
Securing the gathers with a permanent seam
Once the gathers are bunched to the right width and distributed evenly, you are ready to sew them permanently. Lay the gathered edge against the edge it will be sewn to — for example, a waistband or armhole — and pin them together at the center and at each end. Add a few more pins between these points to keep the gathers from shifting.
Sew a standard seam (about 5/8 inch from the edge) along the gathered edge, sewing with the gathered side facing up so you can see the folds and make sure they stay even. Sew slowly and use your fingers to guide the gathers so they do not bunch up under the presser foot. Once the seam is complete, the gathering threads have done their job and can be removed.
Trim the gathering threads by snipping them close to the fabric on both ends, then gently pull them out. They should slide free easily. If a thread breaks while you are pulling, remove the pieces you can reach and leave the rest — it will not affect the finished seam.
Troubleshooting common gathering problems
If your gathering threads keep breaking while you pull them, your stitches are too short or your fabric is too heavy. Try again with a stitch length of 5.0 mm or longer, or switch to a lighter-weight fabric if you are practicing. If you are hand-sewing, make sure you are pulling the thread slowly and steadily rather than in jerks.
If the gathers bunch unevenly — all crowded in one spot — you did not distribute them evenly before sewing the permanent seam. Unpick the seam, redistribute the gathers by sliding them along the threads, and sew again. This is why sewing two rows of gathering stitches is worth the extra time: if one thread breaks, you still have the other to hold the gathers in place while you fix the problem.
If the gathered edge is too long or too short after you have bunched it, you pulled the threads too much or not enough. Loosen the threads slightly by pushing the fabric back along them, adjust to the right width, and then sew the permanent seam. You can always let out gathers a little, but you cannot add more once the threads are removed.
Frequently Asked Questions
Can I use regular stitch length for gathering?
No. A normal seam stitch (about 2.5 mm) is too short to pull and bunch easily — the thread will break before the fabric gathers. You need a stitch length of at least 4.0 mm, and 5.0 mm works better on heavier fabrics.
Why do you sew two rows instead of one?
If one thread breaks while you are pulling, the second row holds the gathers in place so you do not lose all your work. Two rows also distribute the bunching more evenly and prevent the gathers from sliding out of line when you sew the permanent seam.
What happens if I pull the top thread instead of the bobbin thread?
The top thread is anchored at the needle and does not slide as easily. The bobbin thread (the bottom thread) runs freely through the fabric and pulls much more smoothly. Always pull the bobbin thread for gathering.
Do I have to remove the gathering threads after I sew the seam?
Yes. Leaving them in will create bulk and can cause the seam to pucker or pull. Snip them close to the fabric at both ends and pull them out gently — they should slide free easily once the permanent seam is holding the gathers in place.
Can I gather stretchy fabrics like knits?
Yes, but knits bunch less evenly than woven fabrics because the fabric itself is elastic. Use a slightly longer stitch length and pull more gently to avoid distorting the fabric. You may also want to use a ballpoint needle designed for knits to avoid snagging the fibers.