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Oh, nah, I just wore the one they gave out! :)
Any decent high-viz would work even if not technically 'da law'. I did do some research but it was hard to find anything that mentioned the standard.
I just googled... and then picked out any cycling ones.
https://www.google.co.uk/search?q=EN+1150&oq=EN+1150&aqs=chrome..69i57j69i64.375j0j7&{google:bookmarkBarPinned}sourceid=chrome&{google:omniboxStartMarginParameter}ie=UTF-8#q=EN+1150+vest
"According to French traffic law, a high visibility vest MUST be worn when riding at night (safety standard number EN 1150 or EN 471)."
From PBP website.