You mean an inch on each side or a half-inch on each side? Â I want to be very cautious before I f*** up a mtm suit. I emailed Chan to ask if this could be done, but of course they are out of pocket owing to the Chinese holiday.
I'd be surprised if they couldn't take it in by an inch on each side. I recently had a couple of OTR coats taken in by about 3/4" on each side at the waist, and it was no problem--didn't even affect the way the side vents fall closed. Unless you plan never to order from Chan again, I'd let them deal with the issue unless you need the suit too much to let it take a round trip to HK. If you have it altered locally and then wear it back to them for future visits and orders, they will have to guess at what was done when adjusting your pattern.