Grainline

Definition and Overview

Grainline indicates the direction of the threads in a textile, or the direction in which the loops of a knit are arranged. In woven fabrics, there is generally a warp direction parallel to the selvage and a weft direction perpendicular to it, and this serves as the standard for placing pattern pieces.

In apparel patterns, a grainline is marked on the pattern piece to align the fabric direction during cutting. If the grainline is off, it can affect how the left and right sides look, and may cause pulling or twisting when worn.

• Lengthwise grain: refers to the warp direction parallel to the selvage of a woven fabric.
• Crosswise grain: refers to the weft direction perpendicular to the lengthwise grain.
• Bias: refers to the diagonal direction relative to the lengthwise and crosswise grain.

Characteristics and Effects on Garments

In woven fabrics, the lengthwise grain is generally more stable, while the crosswise grain and bias differ in stretch and how they drape. However, properties vary depending on thread type, density, weave structure, and finishing.

Cutting along the grain makes it easier to maintain the garment shape and align the direction of patterns and sheen. Bias cutting can help the fabric follow the body and create a softer drape, but it also stretches more easily.

In knits, the structure differs from woven warp and weft yarns, but the knitting direction and stitch arrangement are treated as the grainline. Because stretch and recovery change greatly depending on the cutting direction, checking according to specifications is important.

Points to Note in Cutting and Sewing

Before cutting, spread the fabric flat and check the grainline based on the selvage, pattern, and weave lines. Align the grainline on the pattern piece parallel to the selvage and place pieces so that the direction is consistent for each hardware item.

Fabrics with pile direction, fuzzy surfaces, sheen, or ribs should have the surface direction unified in addition to the grainline. If directions are mixed, even the same color may appear different in shade or reflected light.

To reduce the effects of shrinkage from washing or steaming and skewing, let the fabric rest before mass production or final cutting, and realign the grain if necessary. In particular, for patterned fabrics, check both pattern matching and grainline.

Difference from Similar Terms

Warp yarn and weft yarn refer to the individual threads that make up a woven fabric, while grainline refers to the direction on the fabric based on those threads. Lengthwise grain and crosswise grain are names that express the grainline in specific directions.

Bias is not a direction unrelated to the grainline, but a direction taken diagonally to the lengthwise and crosswise grain. Because the bias direction stretches easily, the finished result differs from cutting along the grain.

Selvage is the non-fraying edge at both sides of a woven fabric. The selvage itself is not the grainline, but the direction parallel to the selvage is usually used as the reference for the lengthwise grain.

Frequently Asked Questions

Why is grainline marked on pattern pieces?

By aligning the grainline on the pattern piece correctly with the fabric direction, the stretch, drape, pattern direction, and appearance of sheen can be made consistent across each hardware item. If cutting is done while misaligned, it may cause side seams to twist or hems to pull when worn.

Can you cut even if the grainline is slightly off?

Even a slight deviation can be noticeable in long pants, slim skirts, or large patterns, so care is needed. Check the selvage, weave lines, and pattern, realign the fabric as much as possible, and cut so that the left and right hardware items have the same conditions.

Is bias cutting a way of cutting that ignores the grainline?

Bias cutting does not ignore the grainline; it is a cutting method that intentionally uses the diagonal direction relative to the lengthwise and crosswise grain. It is suitable for a soft look, but because it stretches easily, you need to confirm the specifications with allowance for stretching during sewing and hanging.