Why not pack light, and get clothing here? Despite what most people will tell you, clothing of all sizes is available. Thai people actually come in all sizes. You may not able to set any fashion trend, but you will find acceptable clothing in which you will feel comfortable - cheap too! As far as internet recommendations go, I like to use this example: This is a photo of a girl who, in her blogs and forum entries, professes deep knowledge of Thai culture and sensibilities. I'm sure she would say shorts and strappy tops are fine!