Their sizing chart is very misleading, reading it you would say you need a Large if your Medium in Bape. However.. it's not true. I just measured one of my BBC shirts (Large) and they are close to 70cm (neck to bottom) which is 27,6 inch!! NOT 26".. which is a pretty big difference to me!
Same goes for BBC hoodies, on the chart above they say "15".. well okay of course that has to be "25" but measuring one of my BBC hoodies it's 70cm neck to bottom again which is again 27,6 inch. HUGE difference for clothing!
So the best way to check the actual sizes on specific hoodies is going to
http://www.cliffedge.co.jp , click on a hoody and check the sizes per hoody/ jeans whatever.
Good luck!