I got the 10/small vest and it came at the best size! Unlike other t-shirts bought at the same time.
This is light, a great length and not too over-sized!
Being white the only forethought was would it be see through, the answer is... You can see slightly through it although not loads, I would recommend wearing something nice underneath that you wouldn't mind others noticing.
Upon washing this vest top once nearly all the black detailing has faded dramatically... Disappointed, it was a really nice top!