Peking Legation Guard and other Fleet Marines from the Asiatic Squadron ( ie those of Admiral Seymour's relief column) seem to have worn the blue trousers, Marines from the Relief Expedition Battalion coming from the Philippines late July wore khaki trousers.
I agree with the dress blue trousers. However... however, with the Marine Corps supply system, specially back then, there could be pockets or units that wore the khaki trousers. Major Waller joined 140 Marines, from the Philippines, with the Marines under Admiral Seymour. Over the years I've seen the Leatherneck magazine use an illustration of a Marine in khaki with blue shirt. To come full circle, I'd go for the dress blue trousers with the soft campaign cover. I have a book that shows a couple of photographs and an illustration of Marines in blues and soft covers. One of the confusing things of one image is the Lee cartridge belts with Krag rifles.
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