I use Sam the Tailor
http://www.samstailor.com/
He is known worldwide, and prices are competitive.
He's dressed both Bond (Brosnan) and Clinton
94 Nathan, main floor of the Burlington Arcade
Can't remember the TST subway exit letter that's located right beside his shop.
My last suit was italian cashmere/wool and it ran me $4500hkd.
I plan to be buried in it.