Looks like a good jumper overall. My son needed something to wear over his uniform to school to conform to the dress code. He is quite short for his age (11) at 53 inches tall and weighs less than 60 pounds [super skinny]. I chose Medium (10/12) thinking there would be enough room to layer. I asked him to try it on over the shirt and it fits the body well but looks a little tighter than I expected. If he was a medium sized kid in the 10/12 size range I would go up a size. It would probably be too close to the body for layering. Thankfully, it's 100% polyester and won't shrink in the wash. Also, the sleeves are very long. I think it will be warm enough for its purpose (these schools can't seem to get the right temperature in the classrooms).
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