I think this is a type of breastcollar. It does not have the piece going down between the legs to fasten to the cinch, or over the withers like the heavy duty roping ones do. So what would it be called? And what good would it do?
I'm thinking of using it with a bareback pad to keep it from slipping back on a mare who is very cinchy and I do not want to cinch up too tight for her. My concern is if the pad were to slip sideways this chest piece may make the situation worse than nothing without the strap between her legs to keep it from hitting high on her neck on one side while the pad slips down by her elbow on the other side.
Not that I expect much trouble with sideways slipping with no stirrups; but I've had this strap a very long time and never used it because of this concern.