Wanted to post a recommendation for an excellent tailor in Bangkok: Paul’s Fashions. They are located a block or so away from the Nana skytrain stop (station E3) across from the Landmark Hotel. The two main guys there, Daniel and Sanny, are very pleasant to deal with and very helpful, much more so than either of the other places I tried. Quality is better than shirts I’ve paid US$150 for at Nordstrom’s, and their price was only about US$22.
Their address is 99 Sukhumvit, about midway between Soi 5 and Soi 7. Email is sanny (at) paulfashions.com (they have a website at paulfashions.com but I haven’t looked at it – it uses Macromedia Flash, which I don’t have installed). Phone is (662) 2526127 or (662) 2516449, fax (662) 2528783 (according to their card).