What to Pack for Cambodia
Pack for the heat. You might need to change outfits more than once per day so bring enough clothes to allow for this. Saying that, there are fast (24 hours), cheap, efficient laundry facilities in every hotel and guesthouse and every town and village.
Clothes should be loose and light coloured. There is no need to splash out on a new wardrobe that makes you look like Bear Grylls (unless you are trekking for days in the rainforests). Just pack your lightest summer outfits. If you need to buy suitable clothing, then I recommend Rohan. They are designed for traveling but look normal. Cambodia is somewhat conservative and local ladies like to keep their shoulders and knees covered.
Remember that you need to be dressed respectfully at temples and religious site. Cover knees and shoulders.
Most people wear flip flops in Asia, but you also might want a pair of light trainers for temples and trekking Flip flops are most practical in the wet season. Plastic ponchos are available in most stores for less than $1. You won’t wear a waterproof coat as it is too hot. You get just as wet with sweat as with the rain. Better to just get wet and then dry off later. Bring a zip lock bag for phone, money, and passport in case you get caught in a storm.
Sunscreen – factor 50 (having a suntan is not fashionable in Asia). Pack a light jumper as it can be cold in air-conditioned rooms, planes, and busses etc. A small pocket umbrella is useful in the rainy season and doubles as shade in the hot season. Pick up a traditional Cambodian scarf (krama) as soon as you see one, they have many uses.