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A long double-headed arrow aligning a pattern piece with the fabric.
Also known as: Straight grain marking, Grain arrow
The grainline arrow must be laid parallel to the fabric's selvedge. Getting it wrong makes a garment twist on the body as it is worn, and the fault cannot be corrected afterwards — which makes it the most consequential marking on a sewing pattern.
Shows how a pattern piece must be aligned with the fabric's lengthwise grain, drawn as a long arrow with a head at each end.
Contexts: Laundry
Is placed parallel to the selvedge, and a piece cut off grain will twist on the body in wear in a way that cannot be corrected by alteration.
Contexts: Laundry
A long straight line with an arrowhead at both ends, printed across a pattern piece.
The garment marking and the paper marking say the same thing in two places.