Just FYI, the sizing is not correct, in my opinion - but that's Amazon's suggested guidelines...not from the manufacturer.  Try going to their direct website for sizing.  I did both, but still ordered on the small size by mistake.  I ordered the M because I am an 8 with a size 36 chest but I definitely needed at least the L.  I loosened the ribbons as much as I could and still couldn't fit into it appropriately.  Beautiful item though, so no complaints there.