My personal grump is that Father Christmas has been imported, yes some years ago, into Europe from guess where. Father Christmas wears a short red jacket, white trimming, with a black belt and red trousers usually tucked into black boots. His hat is a red bobble hat with a bit of white trimming.
Santa Claus (St Nicholas) is European and wears a long red 'dressing gown' without a belt and with a hood attached to the 'dressing gown'. This is the one from my childhood but Christmas in this country has been so commercialised that we are drowned in Father Christmas.
AIBU to want Santa Claus rather than Father Christmas?