I'll let someone more knowledgeable advise you on the rest of your questions but as far as VT and measurements go, I'll say this: I would not bother trying to get them to measure a coat. Read Peacoat's guide, pick the size that should fit your measurements and then make sure the coat you buy is of the year you desire and has the desired size marked on the original label. 99.99% of the time the measurements will be on the money. You may end up like me and get, say, a size 40 that measured like a 42, but it seemed to be to be the exception rather than the rule. Do not go by VT's measurements. Do not go by their sizing. Look at the size on the label. No label? Pass on it.
I think IronRinn's advice is pretty good when dealing with VT. I would, however, send them the instructions in my guide on measuring the p2p and see what they can do.