I purchased a G TMC Chest Belt for Gopro HD Hero 2 and 3 (Black) from Miniinthebox. It has proved to be an excellent purchase - a solid mount with lots of room for adjustments needed to fit over various pieces of clothing... I am really looking forward to using this in the summer, when I am out on the water in my kayak...
I went out on a walkabout along a skating rink on a river in the centre of the city, and was pleased with being able to record video hands free while doing so.