At the time 58 webbing was widely adapted - the ally thing at the time was to cram in as many waterbottle pouches as possible, as mentioned above. Other adaptions was to have two respirator pouches instead of your kidney pouches (sod that - they would flap all over the place).
It really depended on the CoC in the unit and how much they let you get away with and what the lads got their hands on. Most photos of down South seem to display mostly bog standard layouts however. I was still a wee school boy at the time, but devoured all military information from that conflict - the copy of Janes yearly review in the local library was nearly worn out by my repeatedly reading it (it also had an interesting story in it about a Magneto-Hydrodynamic drive system in some Soviet subs, notably Typhoon class...)
Standard 58 pattern. However, the small pack/large pack were binned. We were given funds from the unit to buy bergen packs (with proper frames) from Blacks provided they were green. When we got to South Cerney, a whole stack of bergens were available which were, obviously, not standard Army issue. As an aside, it was also "stick your crackly waterproofs in that pile over there" and some decent waterproofs (which actually folded up) were issued.
I recall wearing one poncho roll in the standard position and another with NBC above the kidney pouches. Another debate was whether to thread the respirator case onto the belt or wear it separately. The problem for me with any additional ammo or waterbottle pouches (I was and still am a skinny little runt) was having enough room on the belt.
This made Berghaus. One day they where asked to provide x number of Cyclops Roc bergens in green like a lot of the RM had. The work force went into overdrive and working roundthe clock to get the order out. Unfortunately they ran out of green and had to use blue. You can see photos of the Gurkhas loading ship with them on. Some years latter they moved production to China and laid off the loyal workforce who had made the company.
Another thread about webbing eh! Oh well ok. Anybody not sporting a pair of 44 patt water bottle covers on their 58 patt with the tin mug with black nasty tape on it so you didn't burn your lips just wasn't a trying hard!