This plate (and related brief caption) is from the Osprey "British Infantry Equipments, 1808-1908". It and the companion "British Infantry Equipments, 1908-2000" (Men-At-Arms Series nos. 107 and 108) give overviews of the major patterns of British load bearing gear, but at only 40 and 48 pages, respectively, they aren't exactly "in depth" studies, either ... (If it is specifically Officer's equipment you are intersted in, there is another full page of text but, again, it is rather general to say the least ...)
