In reply to HeMa:
But it can't be that hard for manufacturers to supply sizing charts with the harnesses!
We don't all have the luxury of a good supply of local shops to try them on. I have one local shop which stocks barely any climbing kit. After that, you are driving a long way to try one or two in the next shop, then a long way in the other direction to try another one or two!
I can generally guess on waist size, but not leg size. Most XS and S will fit my waist, but leg loops have less adjustment and so fit matters more.
I do regulaly rant about clothing sizes too, they are even more abitrary! I can easily be anything from an 8 to a 12, but that is not today's frustration!