I bought size L (10/12) for my slim tall 10 year old. He usually wears a size 10 but is close to a size 12. It was a bit big for him but still quite fitting. Anyway, it's a slightly skinny cut - not wide at all. However, it is very long and should definitely be worn tucked in as it looks silly if left untucked at that length. The blue striped fabric is darker than it appears on the listing. Based on the photos I thought it was a medium to light blue, but it's more of a medium to dark blue.
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