Thanks for all the information in this thread, it's been really useful.
Has anyone tried Pinky Tailor? (http://www.pinkytailor.com/Suiting.html)
I had a look today and got quoted around 19,000 bht for a Super 160 Vitale Barberic Canonico (Wool/Cashmere from memory).
Also had a look at Narin Couture, but the fabric/suit I had my eye on was out of my price range, around 35,000.
Any advice would be appreciated...