i'm in the process of having a tux made in HK also - i live here, so have approached it as a "warm weather" suit. i won't live here forever, so i would like something that can work back home in colder climates.
I'm using a 260gm wool/mohair mix. seems to be the right mix of warm weather practicality but also will be suitable in colder cities. plus, i got a waistcoat, so i don't think i'll get cold if I need to wear to a formal event in a european winter (for example).