Cambodia history in Siam colonial era:ภาพเก่ากัมพูชา:Siam colonial costume.

Cambodia outfit from Thailand colonial era.
Ayutthaya Kingdom destroyed Khmer empire in 1431 AD
that was why the Khmer people
in Chaktomok Kingdom (1432 - 1535 AD)
--started to follow the dress of Ayutthaya people...
because after Khmer Empire was destroyed,by
Ayutthaya Kingdom
Khmer women in later on Kingdoms
Chaktomok Kingdom = 1432 - 1535 AD
Longvak Kingdom = 1526 - 1623 AD
Oudung Kingdom = 1620-1862 AD
became the colony of Ayutthaya/Siam
(and to Vietnam in some decades)
started to FOLLOW the Ayutthaya dress style