I have a few insights to offer on the general issue. Rather than posting in OMNI, I searched for this thread because it seems that HK is the place that most suit wearers focus on.

-first of all, I will plug the guy that I've been using most often -- Ray 9419 0169; very close to TST MTR exit D
-The pants are the most imporant part of the suit, when doing business in hot climates
-You should select designs in which the pants look good when the jacket is not on your body (classic business styles don't fulfill this requirement very well; think "contemporary")
-I recommend owning at least one stylish rack suit for the tailor to copy (Jil Sander seems to be pretty hot now.... and I've always liked Paul Smith)
-Order at least one extra pair of pants; if you're like me, the pants will get a lot more wear than the jacket