This correction discusses the front neckline gaping. It can happen

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fitting techniques for the neckline, shoulder, and armhole-dart

Pattern Alteration for a Gaping Neckline - Designer Stitch

Gaping Neckline Adjustment

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Front Neck Gaping - no princess seams - How to fix neckline issues

Pattern Alteration for a Gaping Neckline - Designer Stitch

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Technique Tuesday How to deal with a gaping neckline (23rd June