Strapon harness suggestions

My girlfriend and I really enjoy pegging, but can't seem to find a good harness. She is a bigger girl, which limits the choices it seems. The one we have now fits her pretty well, however it has already broken once, which we were able to sew back up, but even though it has a good fit, it seems to move quite a lot during play, making it difficult for her to actually peg me for extended periods.

So does anyone have some suggestions? I preferably would like a high quality one and am willing to spend up to 2-$300.

Thanks!