So, I know that a number of folks on this board have made their own flashes. This is something we will have in common, once I get around to making mine. I was actually hoping to avoid some of the trial and error through your advice! (I'll just put these in bullet point so I don't have to worry about grammar)
-Width of elastic (1/2", 3/4", 1"??)
-Closure (velcro, snap, buckle??)
-Rigidity (plastice canvas backing, double thickness fabric, nothing??)
-Size of flashes (width and length)

That's all I've got right now, thanks in advance!