I fit funny, so SC dimensions don't always help. I actually sized up on IM linen sweaters against advice (which worked) but sized back down for the MTO based on that experience. For the SS coat, I went by Greg's rough sizing where size IV = US 38.I'm sure my orders will work out. Just post-commitment jitters, you know.
Point. I guess there's always the SF marketplace if sizing doesn't work out. I sized up for IM's linen sweaters but took my usual size for the MTO (because pub jacket and zip cardigan are outerwear and therefore bigger). I hope the shoulders on the SS coat won't be too tight.