1. Both the ghurka shorts and the drawstring shorts have a wide waist and are meant to be cinched down so theres is flexibility in sizing for both styles. That said, I wuld say that if you are a 48 in our sal trousers than you should order a 32, etc.
2. The seersucker fabric on the shorts is from Solbiati, not Japan.
3. The Japanese nailhead weathercloth fabric (from Shuttlenotes) uses natural indigo yarn but is water repellant and is truly spectacular. One of the most interesting fabrics I've seen in a long time.
4. The brown field jacket fabric is a textured melange solid, not a check AT ALL. The pattern you are seeing is in the structure of the weave, which is almost like a woven version of thermal/waffle knit fabric.