Definition
Gathering is drawing up a long edge of fabric along loose stitches so it fits a shorter edge, creating soft, even folds of fullness.
Gathers add fullness where a garment needs volume: a skirt into a waistband, a puff sleeve into an armhole, a ruffle onto a hem. The longer edge is reduced by pulling threads until it matches the piece it joins.
The classic machine method:
- Set a long stitch length, 4 to 5 mm (about 5 to 6 stitches per inch), and loosen the upper tension slightly.
- Sew two parallel rows inside the seam allowance, for example at 1 cm and 1.3 cm (3/8 and 1/2 in) from the edge, without backstitching.
- Pull the two bobbin threads together, spreading the gathers evenly between the notches.
- Pin to the shorter edge and stitch on the seam line with the gathered side up.
How much fullness? The gathering ratio is the length before gathering divided by the length after:
| Ratio | Effect |
|---|---|
| 1.5 | Light, soft fullness |
| 2 | Standard gathers |
| 2.5–3 | Very full; suits thin fabrics |
For heavy fabric, zigzag over a strong cord and pull the cord instead of the threads, which cannot snap. The gathered skirt is the easiest place to practice. See how to gather fabric evenly and the gathering ratio calculator.