In reply to fmck:
Idiot check : the green loop is on the back and the two tie-in loops on the front, yes? I only say this because the bloke in Cotswold showed my wife how to put it on one of our kids back to front!!
I find the shoulder straps are a bit lose when free hanging. Lengthening the leg loops and shortening the shoulders helps. Don't go too far, else the tie-in gets near the throat. If you tie-in direct, keep the rope loop really small and it holds the sides together.
I found it a good harness when the kids were small and podgy. Slim and tall - not so good.
Steve