CharlieMungus,
I live and work in Bangkok at the moment and do a few “suit” meetings. I have a decent quality dark linen suit that actually looks ok. I think the pure linen ones do, as you say, look a little crap after a bit but mine seems to stay looking smart. Locally you dont bother with ties and so top button undone all the time so stay cooler that way, also you tend to be out of aircon apartment, into aircon car / taxi, then finally into aircon meeting so you never get that warm anyway. Meetings on the shop floor, thats another matter entirely!
I often don’t wear a jacket either, just good quality trousers and smart shirts, again this is accepted and have met some very senior officials that way with no adverse comments as they tend to dress the same.
Hope that helps. If you are around Bangkok way feel free to drop me an e-mail if you like.
Regards,
Matt.