If you come to Thailand, let a tailor make a suit for you. He will have a nice selection of materials, and the latest catalogues of Armani, Hugo Boss, and the rest of the lot. I trust that behind the lines you can clearly see my message: "He will make an exact copy of any suit in catalogue". For a fraction of the price which you'd pay back home. Unless of course, you live in Vietnam.
And of course, they'll keep your measurements for five years, if you'd decide to order a few more shirts over email, which they'll send you by post.
The good part ends here. The bad part is that tailors are usually very annoying, and do not allow you to pass them on the street without trying to convince of a visit to their shop. It's quite difficult to choose a good tailor that will make quality job, in time. While the suits (or any things that you start the discussion about) are cheap, the things that'll follow will have an increasingly bigger margin. The prices advertised on the billboard outside the building suddenly become invalid, as "they are only used to make an impression on customers". "Surely", they confess, "we will make a dress for the advertised price, but the material will be old".
Still, its worth to try. Collecting my suit and two shirts tomorrow.