A great trove of information; thank you Sator and others who have contributed.
I ordered two pairs of RM's from Barry at Bootsonline a couple of years ago.. Both Yearling Turnouts, one chestnut and one tan. The tan color was MTO. I normally wear a 10 C/D, and Barry recommended a 9 standard width.
They arrived very quickly via DHL and fit like gloves. Customer service from Barry was outstanding in all respects.
These boots are tools for me, as I train horses. They are sturdy but comfortable, and have held up well to abuse. Barry talked me out of the kangaroo leather, saying that it would not hold up to the severe indignities of horse training. My only complaint would be that the Yearling leather is not struck through.
I've had every type and brand of custom boots; nothing compares to RM Williams for fit, comfort, and quality of construction.