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Again Precision Custom Coatings LLC gives us some guidance here.
"Woven interfacings are available in a variety of weights and finishes. The way it is cut will determine how it behaves in the garment.
1. Cut woven interfacings on the straight of grain for firm control and shape.
2. Cut on the bias for more drape and subtle, soft shaping. Bias cutting requires about 1/2 yard more than the pattern suggests.
3. Cut knit and weft insertions lengthwise for stability, preventing stretch and distortion.
4. When used as an underlining, fuse knit interfacings to the fabric before cutting out the garment sections. Be careful to match grainlines.
5. Cut weft-insertions crosswise for supple shaping or flexibility, a perfect method for heavier fabrics.
6. Non-wovens that are stable have little or no give in any directions so it is not necessary to follow grainline during layout.
7. Stretch non-wovens generally have stability in the lengthwise and offer stretch in the crosswise. Examine your silhouette and fabric to determine the direction of greater stretch needed.
8. Bias non-wovens have some stretch in all directions so grainline is not key. This is especially good in cuff and collar areas
Do not be afraid to use bias-cut or crosswise interfacing under straight grain sections of your garment. The layers will work beautifully."
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