The issued stuff is the same as regular army/TA are issued, to be fair, there is now more stuff issued to CFAV's than before including t-shirts, socks and fleeces, however, I'm not a great fan of the smocks, they are too bulky, slow drying, (especially the lower fleece lined pockets) and not waterproof for outdoors so it may be worth investing in something more practical for fieldcraft etc funds permitting.
This is a ACF instructor we're talking about here. He/she would wear full rig to get the milk in from the front door. After checking of course that the neighbours or random passers-by were available so as to admire their 'military bearing'.
I see where you're coming from mate and don't worry I don't think you're Gavin a go lol. I personally do instruct almost nightly during the week at multiple detachments in my company and at our coy HQ. And I'm up for two weeks away and various other week to two week long courses throughout the year. So some spare kit would be great. I've come across some spare shirts so really I'm after some combats.