A tuck is a stitched fold of fabric. It can be used as a way of reducing fullness in a garment but is usually a decorative feature. Each tuck is formed from two stitching lines which are marked and then matched and stitched. Tuck widths can vary, as can the space between the tucks.
Blind Tucks meet – the fold line of one tuck touches the stitching line of the next tuck. Spaced Tucks have a space between them. Very narrow tucks are called Pin Tucks.
Tucks are usually parallel and uniform in width.
Click on the links below for videos of the techniques:
Pin Tucks with Professor Pincushion
Tucks by Threads magazine