As to "closing" it ??? Can you show a picture of it being worn WITH out the "jabot" or neck cloth. I have a couple of friends that do research (for museums) on dress civilian & military jackets during the "Georgian & early Victorian periods. According to my "LIMITED" knowledge this jacket style as well as the PC etc. are "adaptations of these. (???) & perhaps they could insights on their "antecedents" & them being worn (open?closed)
Puffer
This is the jacket with a bow tie which shows how it is fastened -
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