How to check the slipstitch in a tie?
The slip stitch is a loose thread present at the back of the tie underneath the two attached flaps. To check
the slip stitch in a tie, just open the back of the tie as far as you can, to find the loose thread. The slip stitch was invented in 1920s, by Joss Langsdorf to provide ties with more resilience
and strength. A good tie always gathers in folds when the slip stitch is pulled. This means that the tie will move smoothly along the slip stitch, thereby ensuring that the tie does not rip when
wrapped around the neck and will regain its original shape when removed.