Hi, DWHef!
I am not of the hardy t-shirt and bathing suit crowd! We go to Coz 2-3 times a year and here is what we tend to wear:
Dec/Feb--3 mil Henderson Gold for me & 5 mil Henderson Gold for my better(much better!) half;
April-July--Dive Fleece for me & 3 mil or 5 mil Henderson Gold for the same much better half.
We tend not to visit Coz during the other months of the year. In Nov, I think the water temp will more likely be 80 deg F and not 82.
Whilst jellyfish are a relative rarity this time of year on Coz, I still think it is prudent to wear a full exposure suit--skin, fleece, neoprene--due to things like coral. Even though we are not supposed to touch the coral, an occasion surge might do that--that full suit will help minimize the damage.
Enjoy Coz--it is some of the very best diving in North America!
Scorpionfish