I know many of our stateside friends may not be familiar with the series of "Carry On" films but for us Brits they were an institution for many years- basically low budget movies with a penchant for slightly smutty humour, though not smutty enough to call the heavyweight sensors in.
"Carry On Up The Khyber" was one such film, made in 1968, it featured a British (fictional) Highland regiment named the "3rd Foot And Mouth" stationed in Afghanistan near the Khyber Pass (hence the films title), set at a time when India was still under British rule. The British soldiers in the film all wore kilts and pith helmets (with the exception of Roy Castle toward the end who put on a pair of tartan trews, no doubt emulating the officers' mess dress of the period). The costumes apparently had been obtained by the Pinewood studios wardrobe dept from the people who had made the film "Tunes Of Glory" eight years earlier, the tartan being the subject of some contention, it was either the "Brown Scott" or it had been made specifically for that earlier film, was wondering if the rabble may care to discuss the films in question?