Stretch factor for an elastic means how much that elastic can stretch.
Elastics have a length and a width. Elastics stretch in the length direction. The Stretch amount is measured on elastic’s length only. The width of elastics varies: thin elastics are used for panties. Wider elastics are used for bras. Even wider – for waistbands, etc. For lingerie elastics, usually, if the width of the elastic grows, the stretch amount decreases – but this is not a rule!
How to determine the stretch factor for our elastic?
|HOW MUCH YOUR ELASTIC HAS STRETCHED:||THE ELASTIC STRETCH FACTOR IS:|