Referring to the back or interior face of a fabric, seam, or garment. It is the side that will not be visible when the item is finished and worn. Pattern instructions frequently dictate placing pieces wrong sides together to ensure seam allowances end up hidden on the inside of the garment.
Heard on the job
Pin the collar pieces wrong sides together before you baste the edge.
Related terms
Wrong side
The back or inside face of a piece of fabric that is meant to be hidden in the final garment.
Right side
The side of a fabric intended to face outward on a finished project.
RS
The right side of a piece of fabric or a knitted project.
WS
The abbreviation for wrong side, indicating the back or interior face of a fabric.