I think it's worth reviving this old thread, rather than start a new one, just in case the OP still works in PP and needs another pair of shoes.
I live and work in Bangkok, I need shoes, and have large-ish feet (12 1/2 EE to 13 range depending on the manufacturer and the last). I'll post my shopping adventures here. If i decide to have shoes made rather than buy them I'll either find an appropriate thread to add to or start one.
First thing to consider in Bangkok: Most of the places you'd look for good shoes will be on the BTS Skytrain or the MRT subway. You DO NOT want to take a taxi if you can help it. taxis are cheap and plentiful, but Bangkok traffic is so plentiful that you might reach your destination faster walking.
If you need large shoes, Zen in Central World carries larger sizes. I'm not impressed with the choices available, it's mostly Rockport, Clark's,Ecco, that sort of thing. I may resort to shoe-looking-sneakers, i spend at least 5 hours a day standing. Comfy's nice. This type of shoe aren't very durable, however, especially in this climate.
Siam Paragon is walking distance from Central World. There are numerous fashion-oriented posh shops there; I've investigated none of them. However, I have seen Loake shoes in the anchor store. No idea about sizes yet as I didn't need shoes at the time.
Things worth considering for the Bangkok shoe-needy: flying to Hawaii, as suggested above, or the States, or Europe, just for shoes is too expensive. It'll be about US$1000 airfare and up, typically. Not worth it if you're not going anyway. Hong Kong and Singapore are pretty cheap airfares, short flights do-able in a weekend, and reasonably-priced hotels can be found on Agoda.
Shipping shoes from the states is typically more expensive than buying them in Bangkok. Import duty is 40 percent and shipping tends to be expensive because shoes are large and relatively heavy. If you know someone who's flying over from the States (or Europe, or wherever) have the shoes shipped to them, or have them buy them if you're sure of your size. ONLY buy shoes sight-unseen if you are confident of the brand's fit, because NO amount of measuring will give you any degree of certainty regarding fit. I'd bought New Balance running shoes online a number of times, got overconfident, measured the bejesus out of my feet, called the Newton people, had them talk me through it, and ordered a pair of Newtons. It ended badly. They'll be on eBay or Baht-Sold soon.