1920-30's waistcoat with a "loop" between buttonholes

Retrospective said:

Hello!

I recently bought a 1920-30's frock coat with a waistcoat (both are probably tailored in Japan).
On the waistcoat, there is a mysterious small "loop" attached between the buttons (please see the attached files for details).
Does anyone know what this is for?
I did some research but I could not find any information about this "loop".

Thank you.
View attachment 675764 View attachment 675765 View attachment 675766

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RossRYoung said:

Most likely a pocket watch chain

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Mean Eyed Matt said:

I also think that the watch chain is attached to this or that it is pulled through the loop. I know something similar on British suits as an extra buttonhole (not loop) - also vertically between two normal buttonholes.

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Retrospective said:

Thanks for your replies!




I see, the loop is likely for attaching a pocket watch chain...

So I tried attaching my pocket watch chain to the loop (please see the photo below).

I am doing it correctly?
It looks kinda unstable... View attachment 676040

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