I ordered the medium but my 9 year old son wears size 10-12 shirts and it fits me (he is skinny) but instead I had to get a large size for more space and longer use. This is a great kit because in San Diego you really need fleece because it hardly ever rains and it never gets cold, but on a rainy day you put on your outerwear and you can go to school. Hooray! for a bit of rain and we tried it and my son liked it when it was dry and warm.
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