In reply to Lucky George:
The DMM Brenin also covers a good range, I have the regular for use with occasional partners who don't have their own. I think that goes from 18 to 49 inches. I believe they now do an XL which goes up to 60 inches?
I am a bit on the larger side and recently was surprised by the new Grivel harnesses. I think the large size goes up to about 42 inches which seems very generous compared to many of the main manufacturers.