Adjust these recommendations to your personal needs. If you tend to be cold, bring more warm clothing. We'll start from the bottom up. Fleece or wool socks - we provide neoprene booties, but you'll need socks underneath. No cotton socks, they hold water and keep you cold.
Fleece pants work well also.
You'll want both a top and bottom. Fleece jacket or wool sweater - you can always shed layers. Windbreaker or splash top - this will be your first line of defense against the water. This will be worn on top of your wetsuit. Wool mittens or neoprene gloves.