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Double lines showing where a piece may be adjusted.
Also known as: Adjustment line pattern, Alteration line marking
A lengthen or shorten line is a pair of parallel lines across a pattern piece marking where it can be cut and spread or overlapped to alter its length without distorting its shape.
Marks where a pattern piece may be cut and spread or overlapped to change its length.
Contexts: History
Is placed where an alteration will not distort the piece's shaping, so adjusting elsewhere changes the fit in ways the pattern did not intend.
Contexts: History
Two closely spaced parallel lines drawn across the width of the pattern piece, labelled with an instruction.
A fuller structured visual breakdown is not yet documented for this symbol.