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How to measure stretch... and recovery

Patterns often specify that you use a fabric with a certain percentage of stretch.   Easiest method of measuring % stretch?  Use a metric ruler!

Place 2 pins 100mm apart.  See how far your fabric will comfortably stretch.  To 120mm?  That's an extra 20mm or 20% stretch. Stretches to 150mm?  The extra 50mm means 50% stretch. Get the idea?  If it stretches to 200mm that's an extra 100mm or 100% stretch.

This is also a good time to check recovery as well.  If your fabric returns to it's original size, it has great recovery.  If it stays a bit stretched, it has poor recovery and you could have problems with your garment stretching out of shape over time.