Excellent feedback guys. Really appreciated!
I will most certainly check out 'Excelsior' and also 'Blue' in Hoi An.
I also appreciate the tips about not going to Tailors with Touts etc, all this really helps.
I will let you know how I get on!
Fortunately, Travel and Leisure has just come out with the best article I've ever come across detailing the very best shop to visit to have a suit made.
Major of the shops has gone to the international standards accepting world wide mail orders and traveling to various countries to get people tailored.
Excelsior is definitely the most reputable in Bangkok where tailoring is concern and where price the most reasonable.