Once all your strips are cut you want to grab your piece of elastic and measure it around your child’s waist. Since my daughter wasn’t available, I used a pair of her pants as a guide.

Once all your strips are cut you want to grab your piece of elastic and measure it around your child’s waist. Since my daughter wasn’t available, I used a pair of her pants as a guide.
Do you have a tutorial for the cloak?
Yes, I shared in the previous Mermaid post. I generally followed this: http://diyfashion.about.com/od/costumes/ss/Make_a_Cape.htm