Regardless of what you choose to wear, you ought to bring an extra set of clothes and shoes because everything on your body shall become drenched and soaking wet.
Some clothes are better than others. For example, board shorts are always water-friendly. Also, any type of synthetic shorts are a good choice. If you must wear pants, then choose those which are specifically designed for the outdoors and are made of the lightest and fastest-drying material.
You cannot go wrong with wearing a short-sleeved or long-sleeved T-shirt. Because you’re going to be wearing a lifejacket, you might consider wearing an outer shirt that is designed for the outdoors and is light-weight. Eyewear is one of those things that is easily overlooked, so you ought to invest in a pair of plastic sunglasses and a retaining strap as the sunshine in the Southern states is not only nearly inescapable but is also reflected off the water.