• Kaine

Sewing 108 - Fabric on Grain (Blocking Fabric)

Updated: Feb 6

This is an issue I didn’t quite understand early on in my sewing. I thought that once the fabric is neatly pressed and flat, you are good to go.

What does it mean for Fabric to be on grain?

This issue usually affects woven fabrics and not knitted fabric. As I mentioned earlier, your fabric has a length-wise grain and a cross-wise grain.

fabric grain lines
fabric grain lines

The fabric is on grain when the Lengthwise grain is at right angles to the crosswise grain, or when the Warp threads are perpendicular to the Weft threads. In short when the threads of the fabric are straight. This is also referred to as Blocking your fabric.

blocked fabric
blocked fabric

If you fold the fabric selvedge to selvedge, the edges should be straight and at right angles to each other. Fabric will lie where it naturally will, so if you try to force it straight, you will have wrinkles.

grain line on trousers
grain line on trousers

The importance of being on grain is that it affects the drape or the fall of the finished garment, that is why your shirt is smooth and straight and your trouser legs are not twisted.

flannel fabric

It also affects the alignment of stripes or patterns on the fabric that are made by weaving different coloured threads like the Flannel fabric above.

ankara fabric with check print

Please note that the pattern on Ankara and some other printed fabrics have nothing to do with grain lines. They are simply printed images on the fabric. As opposed to a fabric like Flannel or Check where the pattern is created by weaving different coloured threads together and therefore the straightness of the lines is directly related to the grain lines of the fabric

How to get the fabric on grain.

The first step is to create a straight edge on your fabric. This isn’t simply cutting the fabric in a straight line with scissors, rather it is following a straight line of the weave from selvedge to selvedge. There are 3 ways to do this:

a) Tearing the Fabric

b) Pulling the threads

c) Slashing with a scissors

Tearing the Fabric

This is the most common way of doing this and should work on most non-stretch woven fabrics with a tight weave. But do not use this on sheer or delicate fabrics.

Clipping fabric selvedge

(1) Make a clip into the selvedge edge 

tearing fabric to make a straight edge

(2) Pull the pieces apart 

tearing fabric along grain line

(3) This should make a straight edge 

fabric with straight edge

(4) Press the edge with an iron

Pulling the Threads

For fabrics that you may have difficulty tearing such as sheer or delicate fabrics, or fabrics with a loose weave, pulling the weft threads out is the next option.

Pulling Warp threads of fabric

(1) Along the width of the fabric, locate one or two threads that can be pulled out from selvedge to selvedge

cutting fabric along grain lines

(2) This will create a little gap or line for you to follow and you can cut along this line.