Tarzan wrote:
I get the impression that most of the discussions for cold weather gear are for ares that are quite a bit colder than Corpus Christi.
Today we have 48 F air and 57 water. This is central BC, Canada. This is not even as low as you described, but it will go much colder as expected. Most of folks here are turning into other than boating activities, by now. Skiing season will start within a few weeks.
Your approach will work well to up to combined 90-110 F as per John 120 rule. Just make sure you have good booties (3-5 mm) and neoprene gloves (2-3 mm), and a some sort of a headwear. Your body "ends", hands, feet, and head, will get cold first, so it is important not to neglect them.
I am using farmer john 3 mm, 1 mm neoprene shirt, spray jacket, 3 mm booties, 2 mm socks, 2 and 3 mm gloves, and a light paddling hood. I like multiple pieces option to adopt to actual conditions. A full wet/drysuit is much less versatile and generally more suitable to colder conditions, you described.
Also make sure you neoprene fits well. It should be pretty snug, but not painfully so. Neoprene only works if it is close to to the skin. Also your neoprene will kind of swell when wet, but you want to be comfortable when dry as well.
Here is a good guide to wet-suits:
http://360guide.info/wetsuits/water-temperature-chart.html#axzz3IbywUs5c