You will basically sew the extra strip inside of the two pieces of fabric like a sandwich.

You will start by sewing the strip to one side and then sew it to the other piece.

It is basically a seam join.

How To Make Piping For Any Sewing Project - Piping Without Cord - Easy Sewing Hacks

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Then, you will unfold your project and iron it.

This way of sewing piping is so easy and adds so much to any sewing project.

Easy Ways To Sew Piping - How To Sew Piping - Add Piping To Any Seams

Easy Ways To Sew Piping - How To Sew Piping - Easy Ways To Use Piping In A Sewing Project