Joye You are correct. This is the collor of Thailand's Most Illustrious Order of the Royal House of Chakri.
This is one Order where the collar can be worn with the sash (which is bright yellow).
Some of these "chains" have no sash associated with them. Others can have both a sash and a collar. Usually (but not always) the collar and the sash are not worn together. The collar is usually considered the higher ranking element of the order and, if the collar worn, then the sash is not.
The Order of the Garter follows this principal. Therefore, when Prince Philip wears his Garter collar he will often wear the sash of the Order of the Thistle instead.
--Previous Message-- : : : The Queen wears chain of various Orders she : has receive. I think this might be a Thai : chain. : : Might we be able to find a collection of the : various chains and Orders pictures? : : : :