Let's see how it is in the Army
All have the red diamond centred on the cuff.
Note that The Black Watch have one more diamond showing than the other regiments. (Well, the DM of The Highlanders has his a bit askew.)
Thing is, properly/traditionally made hosetops are form-fitted and have a seam at the back, just like proper full hose do. So there's no way to get them wrong as long as you have the seam in the middle of the back.
Unless you're like the guy on the left!!
(This is one of the most wonderful "play dress-up" photos I've come across; it deserves study.)
















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