Hi Alan, when Australia first committed mainstream troops to Vietnam (as oppossed to trainers and other "interesting" forces they wore essentially 58 and 44 pattern Jungle Greens. The webbing was a mix of US M1956 H harness, Belt, Bum Pack, FAD pouch and Waterbottles. SOP is a MINIMUM of two waterbottles but many more including collapsible canteens were carried depending on Op duration. Packs were initially the old WW2 era large 37 pack which were replaced by the Austpac and US lightweights where these could be begged, borrowed or stolen.
Initally the pouches (basic) were M1956 and 37 pattern with the Aust Pattern 44 Bren Pouches being extremely popular. These were usually attached to the belts (US pattern preffered) by cutting slits in the back or using the brass hooks. The upper buckles were generally cut away. The Larger Aust F1 Basic pouch similar to the US large ALice ones but in Canvas duck were introduced in 68 but 44 Bren pouches were prized for their size (I was still using mine in 92 until the new Minimi pouch was issued).
With 3 and 1 RAR there was a little bit of Brit kit from working alongside in Borneo but the Brit 58 Pattern kit was despised as it soaked up water and got very heavy then rotted. The Brit 44 Pattern Waterbottles were highly prized but rarely seen after 67. I have yet to see a Brit 44 Patt Rucksack carried by an Aussie in Vietnam. Bushhats were almost always worn in preference to US M1 Pots but these were worn along with US Flak Jackets when operating in the mined areas around the Long Hais 69+.
We wore essentially the same webbing through to 1992 in some cases.
Cheers
Al