what size do you wear over there? Doesn't the website provide any guidance?

My son [8] wears M in concert shirts and it isn't a parachute for him either, just comes down to his knees. I don't think that there is so much of a difference in chestsize (maybe an inch or so) as it is a matter of length.

I can measure some for you once I get home.

What are you going to order?