To be honest, Thailand was the first time for the last years that I didn't bring any knitting with me - knitting with white in the tropics? Not such a good idea. And I didn't feel like knitting anyway. I would have felt like the only person knitting in Thailand, because I didn't see a single person doing it. But I did see quite a bit of crochet.
Crochet also seemed like a popular pastime for some masseuses (that gave us those great massages) while waiting for customers.
I also found one fabric store called PhaiBoon in Hua Hin.
And you could always see some kind of sewing shop.