I'm not sure how big ice gear and the other manufacturer are.
Again it would only financially hurt the club if it was a manufacturer making knock off cardiff shirts, it's just the fact you pay for copyright so someone else can't use your design. If a manufacturer is using your design without your permission then it's pointless having copyright.
I used the Jack Daniels outline of the logo for my Rock T-shirts and asked Jack Daniels permission just to use the outline nothing else but even though i only sold them from my bar on a small island in Greece and wouldn't effect them financially anyway what so ever they still said no due to copyright law.
Anyway, the youth side now only use the lettering "Devils" and have removed the face.