As mentioned in the weather section, it is always hot or at least warm in Cambodia. Light, loose-fitting clothing is recommended and natural fibres like cotton will make you feel most comfortable. It is advisable to have something warm to put on if you do feel a little chilly – this is most likely to occur in heavily air-conditioned environments.
Remember that you will need to be clothed respectfully if you are going to be in temples and religious sites. Both men and women should cover their shoulders and legs, and shoes and hats should be removed. The latter also applies when entering houses and some shops.
Nude sunbathing or swimming is not acceptable in Cambodia and it is a good idea to ensure that you have loads of sunscreen with you.