I would look at purchasing a full 3mm wetsuit as you will no doubt obtain a better fit and know that you and you only have took a leak in it versus countless others.

Also, one can obtain a adequate wetsuit very inexpensively now days versus the cost of renting perhaps an ill fitting, worn out and pee encrusted wetsuit. Also, most rental suits are mens. Not great if you are female as there are sex specific suits. Do a google search and see what you find. When I say inexpensive I am saying $80 to $100 bucks