Hi Jan
Great to hear you are joining Yvonne and myself on this trip. I booked this a while ago now and so have spent ages trawling through previous posts to get all the advice I could on this trip.
With regards to money I plan on taking a Cash Passport (from Travelex but there are others out there) pre-loaded with 5000 rand and then a further 5000 rand in cash. I'm going to do most of the excursions so will need a fair amount. It sounds very easy to go to ATM's to top up if needed. The recommendation is to exchange money for Zambia before you leave South Africa as the fees are lower (someone said that you can use dollars, rand or pounds).
It would appear that your South African plug adaptor can be used in Zambia.
Don't forget your mozzie spray and Malaria tablets (needed from Durban onwards).
As regards clothing, I generally wear trousers anyway, but I think the main thing to remember is comfort over style. My experience of these holidays is that people rarely comment on (or even notice!) what each other is wearing - after all we're all in the same boat with luggage allowances. If you bring a small amount of travel wash, you can generally rinse things out and dry them overnight if necessary.
Hopefully if I've got anything wrong, someone will put me right. Any other advice would be gratefully received. So far there are 18 of us for the main tour with 8 going on to do the extension. Just over five months to go and I am sooooo excited!!!
Sally