I transferred from the Reserves to the Reg F in the summer of 1969 at which time my southern Ontario Res unit was still using the bush/battledress uniforms and 51 pattern webbing while the regular force was uniformly in combats and 64 pattern web gear. One thing was that 51 pattern basic pouches seemed to hang on for a while for use as C2 magazine pouches because everyone universally hated the C2 magazine chest rig. (the "mag bra"; an idea just as bad as the six C1 magazine slots/sleeves built into our combat shirts)
One point that many may not recall: the 64 pattern (even the mag pockets in the combats) was designed specifically to be particularly austere to make it easy to use for APC borne infantry. It was easier to mount/dismount and operate inside the tracks and never meant to be a major load bearing component. The theory was that on the modern battlefield (possibly nuclear) we would remain within our armoured vehicles much of the time and dismount to fight only briefly.
:warstory: