Thanks for the info.
I'm looking at the blue Havana (modern cut?) plain navy wool ( http://us.suitsupply.com/jackets/jacket-navy-plain-havana-c540e/C540E,en_US,pd.html?start=6&cgid=Jackets&prefn1=fit&prefv1=Havana&prefn2=fitID&prefv2=Notch%20Lapel ) and the size advisor is telilng me to size up to 38S (I'm ~ 36S mostly). I guess the Havana is considered a modern cut? which would correlate with your experience.