At the last Confest I attended, I went nude most of the time but wore a money belt like this. http://www.ebay.com.au/itm/Push-Pocket-Belt-Zip-Security-Secret-Money-Slim-Outdoor-Yoga-Travel-Protect-/262351933504?hash=item3d1564d040:g:l2UAAOSw9mFWF3Fk
if i really need to carry money with, or the car key, i use a "wrist wallet" from the outdoor gear departement. But i often fix it at my ankle, it's long enough.
Missed this yesterday: long time i used a so called "beach box". It's a little waterproof plastic cylinder, you unscrew it's two parts to open it. It has a lace loop to hang it around your neck. Since i bought another car, i didn't use it any more, because the bigger remote key doesn't fit in the little container.