Grain line denotes the orientation of warp yarns in woven textiles. Some properties of woven textiles like elasticity can vary extremly whether measured parallel or orthogonal to the grain line. Knowing the grain line is necessary to plan a cut. The grain line is generally parallel to the selvage.
Literature
edit- Annette Fischer: Basics - Fashion Design 03: Construction, AVA Publishing, 2009, ISBN 978-2-940373-75-8