Sewcharmingquiltshop.com
I had forgotten to video some steps so you will see that I changed fabrics. I started videoing again when I started the second one since I was making two anyway.
Straps are at the 13:42 section of the video. Cut three 2 inch wide strips. Sew them end to end. You can shorten them at the end if you like.
For a child size, use a fat quarter instead.