Fabric-Stretch Pattern Scaling

Knit patterns use negative ease— the pattern is cut smaller than your body, and the fabric stretches to fit. If your fabric doesn't stretch as much as the pattern expects, the garment will be too tight. If it stretches more, the garment will be loose.

Different body areas need different amounts of stretch. The bust and hip need the most (they're the widest points you need to get the garment over). The waist often needs less because it's narrower. Sleeves need enough stretch for arm movement.

Use the Knit Stretch Calculatorto test your fabric. Cut a 10" sample, stretch it, and measure. The calculator gives you the percentage.

Test the horizontal stretch (across the width of the fabric, perpendicular to the selvage). This is the direction that wraps around your body and determines fit. Vertical stretch matters for length but is less critical for sizing.

The "overall" number at the top is an average across all zones. For a quick adjustment, apply it uniformly to all pattern pieces. For a more precise fit, use the per-zone percentages — they account for the fact that different areas need different amounts of stretch.

For example, a fitted t-shirt in low-stretch jersey might need 3% reduction at the waist (waist has ease anyway) but 0% at the bust (bust needs all the stretch it can get).

If any zone shows "Critical", the garment will be too tight at that point even with width adjustments. In that case, consider:

• A fabric with more stretch
• Adding an opening (zip/zipper, buttons) at the critical zone
• Switching to a pattern designed for lower-stretch knits
• Using the fabric for a less fitted garment type (relaxed top instead of bodycon)