Dave,
My favourite kayaking clothes are made by Columbia.
http://www.columbia.com.au/products/men ... &catID=191The Silver Ridge convertible pants are very versatile. You can start out in shorts (great for launching) and then when the UV gets high zip the legs on. They are very quick drying.
I also use the shirt which offers great ventilation but still has sun protection.
Fishing shirts are also effective. You can get them from BCF or Kathmandu.
I use trekking socks from Kathmandu that are made from activent which is also very quick drying. In Winter I wear Sealskinz waterproof socks over the activent socks. You can step in water with this combination and your feet remain dry and comfortable. Much better for all day wear than wetsuit booties.
Just make sure there is no cotton in any of your clothes. It takes far too long to dry.