Illustrations of what is considered inappropriate clothing and behaviour are being posted on the organisation's website, an English version of which is still under construction.
Angkor Wat, the spiritual centre of the Khmer empire that dominated the region from the 9th to 15th centuries, is Cambodia's biggest tourist attraction, a UNESCO World Heritage site, and a symbol of national pride that is emblazoned on the Cambodian flag.
About 2.1 million foreign tourists visited last year.
Immodest dress is not the worst breach of modesty the temples have suffered.
Early last year there was a small spate of Western tourists who posed naked for snapshots, and those who were caught were fined and deported.
- AAP