Here is what I would prefer:
- Black (but not an absolute must, but at least dark brown)
- Very adjustable OR pony sized. I have a 15hh horse with a short neck and the one that I use on my 17hh horse is not adjustable enough. Needs to have holes that go shorter than most horses.
- would prefer a clip on the attaching part because that's what I'm used to, but a buckle is absolutely fine as well.