How do I make one?
A flat felled seam is a seam that has no visible seam allowance, like what you see on denim pants. They can also be found on sportswear, button up shirts and canvas. You might want to use a flat felled seam on a bag, shirt, pants or a heavy duty project. Flat felled seams look very neat and clean since you can’t see the seam allowance and are a great way to finish off a project to make it look nice.
You can do one of these seams with a simple straight stitch sewing machine. This type of seam is a bit complicated to start, and would be good for an intermediate sewer. You will need scissors or rotary cutter and an iron. If you are using a heavy duty fabric, make sure you have a very sturdy needle and thread because you will be sewing through 4 layers and you don’t want your needle or your thread to break.
Creating the flat felled seam
Start by sewing your fabric with wrong sides together with a 5/8″ seam allowance
Iron your seams apart, with one side touching your project and the other one touching your ironing board.
Cut one side of your seam allowance to 1/4″
Iron your seam allowance together and fold the larger seam allowance over the smaller side. Iron flat.
Next, press the seam over so the raw edge of the seam allowance is hidden and pin flat.
Sew right next to the fold in your fabric. That’s it!
