I know fitted sizes are all the rage, but they are difficult to get hold of, especially for such a small lot purchase (under 100 items is small), plus it put's the price per item up considerably, usually it's a "one size fit's all", asian made, adjustable velcro or buckle strap.
But I'm not going to do anything like organising these to be made, as the initial cost of setting it all up, plus I'll have to bear the brunt of the manufacturing cost's until people start paying, not to mention additional shipping costs to the U.S, Europe or wherever, is just a bit too much for my finances to bear at present, as I'm between work contracts, again...
I have to leave this sort of thing to more financially secure members to organise, at present...