What does the "dicing" mean?

[MacWage]

I've seen mention before of Highlanders wearing Indian leggings whilst on North American service; a "field expedient" uniform to be sure.

Todd

I've seen it referenced in several books, inc. all the relevant Osprey books. They wore leggings, with the question of whether they were "above the knee" socks, actual pants, or leggings like those worn by bikers over jeans (which get several names, usually called "chaps").