The only khaki trousers I have seen with stripes are for cavalry, with yellow. I can find none other - even of those showing NCOs, one of the reasons chevrons were authorized for shirts (unofficially in 1899, officially in 1902). Several references stated that "one could not distinguish officers and NCOs when in shirt-sleeve order." Blue trousers kept the stripes, as they were used for dress, as well as undress uniform order.