You will need to make or buy bias tape. I didn't buy it because I wanted it to match my fabric exactly. I had never made bias tape before (and I am sure you can tell that if you look closely at the vests). I found a tutorial for making continuous bias tape on Coletterie. Continuous Bias Tape Tutorial. It was very helpful. I cut mine in half from what she recommended which made it smaller to work with. It was the right amount for this project. I ended up getting the bias tape maker (affiliate link) tool she shows in the tutorial. I can't imagine making it without that tool. It was really helpful, but I still found bias tape to be a challenge.
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