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In page Frock coat:

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The cut of a frock coat with a waist seam flatters a man's figure, as opposed to a sack coat and such frock coats remained part of some 21st-century military uniforms. They can either be single-breasted, as in some army uniforms, or double-breasted as in both army and navy uniforms. An example of the latter is seen in the modern gala dress of officers in the Spanish Navy.[1] The British Army currently retains the frock coat for ceremonial wear by senior officers of Lieutenant-General rank and above, by officers of the Household Division, by some bandmasters and by holders of certain Royal appointments.[2]