Why do so many vintage sewing patterns have a seam down the middle

Style 3734, Vintage Sewing Patterns

Why do so many vintage sewing patterns have a seam down the middle? why did we stop : r/sewing

mens vintage sewing pattern

Sewing: Custom-Make Clothes Simplistically. Design Patterns. Sew Easy., Krissy Wright

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Style 2823, Vintage Sewing Patterns