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Prepare Fabric ProperlyStraighten the grain and prewash to start projects right
You’ve purchased a lovely piece of fabric, and you want to sew something wonderful with it right away. Wait! Step one of any garment construction process is making the fabric ready to cut and sew. Don’t forget to prepare fabric for sewing by checking and, if necessary, straightening the grain; assessing the textile’s colorfastness; and preshrinking it. In fact, all the components of a garment need to be preshrunk, including interfacings and linings. (Back in the 1950s and ’60s, before polyester zippers and twill tape, even those notions needed to be preshrunk.) This sounds like a lot of steps to take before you get to sew, but each one ensures that problems won’t arise in the finished garment.
Assess the grain
Begin fabric preparation by creating accurate, straight, cross-grain edges. Then use these edges as the basis for evaluating and correcting a skewed grain.
Two ways to straighten the ends
Correct skewed grainlines
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For the shrinking of the interfacing, because it is going to shrink with the steaming, how do you know how much bigger to cut the pattern in the interfacing before steaming is accomplished?
The actual shrinkage of the interfacing is negligible. I use the same pattern pieces for the interfacing as I used to cut the regular garment.