Keep in mind that I believe those are actual measurements of the pants themselves rather than the waist size they are intended to fit. If you haven't already, measure some pants that fit you the way Greg does with the NMWA stuff; I think you'll find the trouser waistband measurement on the outside of the trouser is a bit larger. I'd agree that if you are a 31 in waist size, the pants from a 38R Formosa are more likely to fit you. In any event, I think visiting Greg when you are in NYC next and getting his thoughts is probably a good idea.
Yup. He told me how to do measurements on the trousers.
Oh the drama in my SF life never ceases.