I use a Quick Spot vest but it offers no protection to briars.
Use purely because my dogs are dark.
Some dogs just don't have the proper coat to hunt briars. I a k ways look at the chest and leading front leg edges as that is what takes the beating.
I also stay away from full body vests or chest protectors. Put on a dog and its a poor fit high desire dog will wear sore spots shortly you'll pay for later.
The Quick spot vest is nothing more than a highly visible flap attached at the collar and an elastic belly strap. The covering rides on the back.
JW