It would be P44 webbing and Jungle green shirt and trousers with a boonie style hat. Most pictures seem to be without webbing, just a belt, probably these are in less remote locations where minimal kit needs to be carried and everything is in armoured cars. You start seeing higher leg boots or Jungle boots in later photos and always it seems to be puttees rather than gaiters.
Weapons seem to be Stens for the Malayans and Owen guns for the British and Australian troops along with the Lee Enfield jungle carbine and some M1 carbines. Lots of Bren guns, but perhaps photographers just like to take pics of the guy carrying the biggest gun