The direction of the yarns in a woven fabric, with lengthwise grain running parallel to the selvage and crosswise grain running perpendicular to it. Proper grainline placement is crucial for garment fit, drape, and stability.
Compound of 'grain' (from Latin 'granum' meaning seed or small particle, extended to mean the direction or texture of materials) and 'line'. In textiles, grain refers to the direction of threads, established in weaving terminology by the 16th century.
Grainline is like the DNA of fabric - ignore it at your peril! Bias cutting (cutting diagonal to the grain) was revolutionary because it allowed fabric to stretch and cling to curves, which is why Marilyn Monroe's famous white dress could fit her like a second skin while still being made from non-stretch fabric.
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