What mechanism constituted the true revolution in achieving a secure, interlocking stitch?

Answer

Lockstitch mechanism

The true mechanical breakthrough in sewing technology was the development and implementation of the lockstitch mechanism. Earlier attempts often relied on single-thread chain stitching, which, while fast, had a critical vulnerability: if a single link in the chain broke, the entire seam would unravel. The lockstitch addressed this fundamental flaw by utilizing two separate threads working in tandem to create an interlocking stitch below the fabric surface, resulting in a far more durable and secure seam essential for long-lasting garments.

What mechanism constituted the true revolution in achieving a secure, interlocking stitch?
inventionIndustrytextileinnovationsewing machine