Even with a modest breze, a reflector for a full body shot really needs an assistant holding it. They need seriously sand baged stands to stay still in all but indoors in my experience. I have a no name chinese one that pops out to about 3x5' that is good for full body shots.

It has a white diffuser core, with silver, gold, zebra and white available as a slip over reversible cover. It is not as fast to use with the cover, but a good deal more flexible.

Reflectors sometimes need to be just out of the frame to be effective. This is where an assisitant holding the reflector is most useful.