Kids sizes are XS ( 2/4), S ( 5/6), M (7/8), L (10/12), XL (14/16)
Adult size are S, M, L, XL, 2XL
Once the campaign is over and funded I will send you an email through the Kickstarter system to get the size information from you.
Don't see the answer to your question? Ask the project creator directly.