I travelled in Cambodia (also Thailand, Vietnam and Laos). My favorite clothes became an ankle length sarong bought in Thailand (in a dark color) with a short sleeved top, whenever I crossed a border or went someplace more conservative, I put a white button down long sleeved shirt on over that. It was light weight enough to still be cool (plus it protected me from the sun) and I found that dealing with officials was MUCH easier when dressed this way. Sandals (Teva style) were fine everywhere and good for taking on/off all the time. If you ride as a passenger on a motorcycle learn to ride sideways like the local women do (esp. in Cambodia and Vietnam), important if you are wearing a skirt. Make sure to keep clean and have clean hair, even the poorest people bathe as often as possible and are very insulted by smelly “backpackers”.
Shelly, Tampa, USA