Boy, am I glad I found this place.
BellyTank I know exactly what you're talking about!
I spent about 3 years a while ago ob-sessed with that whole 1920-1950 colonial and post-colonial sub- and equatorial khaki/canvas/brown leather vibe...not just in clothing, but general design and style ethics as well...EP was a rich source for that, and check out any of the old advertising materials for Pan Am airlines (All about the flying boats!!!)...
Of course, actually living in Asia helps to float the vibe.
A pretty cool source for some of this type of gear was the deeply missed Willis & Geiger catalogue...one of their last catalogues (print only! no website! orders by fax or mail only) actually even had that fantastic old painting of the Pan Am China Clipper landing in Hong Kong harbour.
W&G absolutely had the Ghurka-waist utility pants, and lots of other similar suberbly made garments.
And now they're gone, what a shame.