If you are making a garment out of a knit or stretchable fabric, use a similar stretching fabric for a fitting sample. The most important characteristics in a sample knit are that it stretches the same amount and has a similar weight and thickness as your final fabric.

Step-by-Step Method to Measure Fabric Stretch

1. Take the cut edge of the fabric on the cross-grain edge (not the selvage edge) and measure 10” (20 cm) with a ruler flat on the table.
2. Allow a little space between the selvage and the end of the ruler, placing a pin at “zero” and another pin at 10” (20 cm). This is the original amount unstretched.
3. Stretch the 10” (20 cm) with your entire hand to its maximum. Grasp as much of the fabric as you can with your thumb and hand.

Example Calculation

For this example, the maximum amount when stretched is 15” (30 cm).

• Maximum stretched amount: 15” (30 cm)
• Minus original amount unstretched: 10” (20 cm)
• Equals stretched amount: 5” (10 cm)

Next, calculate the stretch percentage:

Inches: 5” ÷ 10” = 0.50
Centimeters: 10 cm ÷ 20 cm = 0.50

Take that divided amount (0.50) and multiply it by 100:
0.50 × 100 = 50

Result: The stretch amount is 50% for this fabric.

This information and more can be found in The Fitting Book. Order your book today through the link below.