Sorry had to post and run before, but more detail about the girth I have..
So far I've only used it on Bert, who has to have it on nearly it's largest setting, which means that the narrow part of the adjustment strap is in those big keepers each end. That and the fact that the girth is shaped and the strap isn't means that in practice the two parts of it tend to separate under her belly and it looks uncomfortable to me.
To be fair she shows no signs of complaint or any discomfort, and at the moment I'm happy to use it as we are only doing ground work still. I will put off riding her until I get a girth that fits
BTW anyone got a 56" girth they don't want
I'm still trying to work out a fix that makes it work better.