-
http://www.paris-brest-paris.org/index2.php?lang=en&cat=randonnee&page=reglement
Article 18:-
"
Absence of (or hidden) reflective vest at night 2 h time penalty
" -
seeing as you're not french, or francophile, if a steward type person gets a negative notion about you (cos you're riding too fast and not french) and enforces les regelements, it'd probably be a less risky strategy to just wear the vest provided FOC with PBP pack.
^PBP vest totally EN471 compliant with width and placement of reflective bands
That's probably too compliant for the French, but they do look lovely.
#gallicshrug