I knew a welsh girl who used to call them 'Daps'
Apparantly the initials of the rubber factory in Bristol where the soles were made as Dunlop Athletic Plimsolls.
Also was calling them plimsolls in any way related to the plimsoll line on ships?
…..Plimsoll Line on ships apparently named after MP Samuel Plimsoll who campaigned for load lines on vessels
