If you are a civillian the Navy Jacket would still be OK if you changed the buttons and removed all of the colored piping (gold trim) and shoulder boards. Oddly it is the buttons and trim that makes an otherwise civillian coat into a uniform anyway.
If you are reserves or active military you will have to wear the uniform as close to regulation as possable with a kilt. There are dozens of photographs of Sergeants Major wearing the kilt with their dress uniforms so it can be done. The Army Band has pipers in kilts but there is no regulation allowing them (SGMs & pipers) to wear the kilt, then again there isn't any prohibitation on the kilt in the regs either.
If you are a retiree wear what you want. Retirees fall into the grey area of being both civillians and military at the same time and neither. US Federal law allows veterians to wear the uniform. Not just today's uniform but the one that you wore historically even though that would be against regulations. So that effectively (by law) retirees are NOT subject to regulations.
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