Seam slippage is when a sewn seam opens under load and some of the opening remains even after the load is removed. It can be caused by loosely woven fabric, not using enough stitches per inch, poor stitch balance, or having too narrow of a seam margin. When two pieces of fabric are pulled at right angles to the seam, it can reveal a gap between the pieces called a seam grin, showing the thread in the gap. Proper testing can identify issues with seam slippage.

1. SEAM SLIPPAGE
Seam slippage is the condition where a seam sewn
in the fabric opens under load. Some of this gap may
close on removal of the load but some of it may be a
permanent deformation.

2. Causes of seam slippage
• Loosely woven fabric {Fabric with low number
of wefts and warps}
• Not using enough stitches per inch
• poor stitch balance
• too narrow seam margin

3. Seam Grin
• When two pieces of fabric are pulled at right
angles to the seam, a gap is revealed between
the two pieces of the fabric revealing the
thread in the gap.

4. Seam Slippage Test