Just FYI :
<font face="Verdana, Arial, Helvetica, sans-serif" size="2">There are a lot of tailors in Bangkok. Most aren't very good.</font>
Absolutely. As anywhere, you get what you pay for.
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I use Raja's Fashions at 1/6 Sukhumvit Soi Nana 4 (opposite the Nana Hotel) 02.253.8379.
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As do I. Mr. Bobby does excellent work. It will be a bit more expensive than many of the other places, but if you want good work, you'll get it there.
And be aware that
Raja's Fashions ≠
www.rajastailors.com
Cheers,
F2K