A dart that is sewn in heavy or dimensional fabric and pressed to one side can be unattractive and bulky, because you’ll have three layers of fabric, one from the garment and two from the dart. These multiple layers may not cause a problem with your new garment, but they will start to shadow through (imprint) on the right side after several washings, dry cleanings, or pressings.
There’s no need to cut the dart open to achieve a flat, even effect on both sides of the dart stitching line. Many pattern instructions call for the dart being slit along the length of the fold and pressed open. This involves making a slit in your garment from 10-in. to -12-in. long, which weakens the garment at every double ended dart around the body.
Instead, a balanced dart adds extra fabric to the opposite side of the dart seamline…
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