Help with T-shirt sizes.?

Well the band fall out boy are releasing a new album which you can pre order over the internet. i live in australia so i’m not to sure between the difference in sizes. when i went to pre order its came up with xs(youth large) what does the youth large bit mean. Heres the link if your confused http://gomerch.com/interface/body.php?module=store&id=3 its the second square in it should say infinity it worth $69 click on it and scroll down to the t-shirt sizes and you will see what i mean. if you could help it would be highly appreciated!
thanks

on the right-hand side of the website, above the shopping cart, it says

Size Info

Please note: All Sizes are Mens/Unisex sizes unless otherwise noted.

‘Click HERE to see our Size Charts!’
and if you click on the ‘click here’ it brings up a window with the size charts

T SHIRTS!!

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