SurfFur Water Parka not inexpensive but very practical in colder climates. If you have a group for a volume order they have given group discounts in the past.
Getting out of Your Paddling Gear
Foam Pad to Stand on - warmer, more comfortable to stand on, protect the gear you are getting out of - keep your wetsuits clean, minimize wear from contact with rough surfaces
Changing Room? If you don't have a bathroom nearby, you can use a towel or some kind of robe or poncho for privacy.
Some robes like Surffur are built to assist changing clothes - roomy enough for clothes changes and providing holes in outer pockets to allow inside access.