The slipstitch allows the fabric to move when the wearer is pulling the knotted tie to adjust it.

This maintains the correct tension to stop the unattractive rucking (stretching) effect that can appear when knotting the tie.

The stitch is secured with a bar tack at the tail, leaving a small loop of excess thread inside the tie.

This loop means that however much the tie is stretched, twisted or scrunched, it will return to its original shape if hung or rolled.