True Bias Tutorial

Bias runs diagonally in a woven fabric.  The "true bias" runs exactly 45 degree angle to the grain lines and it has the most stretch in a woven fabric.

When to cut on the Bias?
Typically the straight grain cut is fine for your bias, but for a project that is curved or shaped the true bias is what you want to use.  This is also great for curved applique pieces.

Another reason to cut a true bias is to create a visual effect such as using plaids or stripes.  It will create a "barber pole" effect and is pretty neat.

Cutting on the Bias

1.  Start with a fabric square or rectangle. 

2.  Using a ruler and rotary cutter cut one edge at a 45 degree angle. 

Measure out how wide you want your strips.  These are traditionally 2 1/2" wide.  Continue cutting strips until you have the length needed.

TIP:  To prevent the fabric from distorting spray with starch and iron prior to cutting. 

3.  Sew your strips together matching diagonal edges.  Iron in half, wrong sides together. 

See how easily the bias strip curves on this bag. 

Tada!  Now you are ready for those curvy projects!