I should have said Japan XO size.
XO counts as XXL for them and even
an O is an XL.
It's all very confusing but the chart
here may assist (go down to male size).
I have on occasions seen XO listed by
Japan speedo suppliers but here it is
qualified as customised, so a longer
wait for delivery is likely I would guess.
http://japanswimshop.com/swimsuit-size-chart