Rank badges
I have been watching a French crime thriller,and I noticed that their policemen/women were wearing their rank 'epaulettes' buttoned onto the front of their shirts as seen on British/US soldiers.Do any of you current or ex-military people know of a reason for this change from the previous practice of displaying rank on one's shoulders ? Is it just current fashion ? (I am aware that RAF/RN still have rings on their sleeves).