Rascal clobber

Either...

1) An outfit which is out of the ordinary, very posh and naughty

2) An outfit which is an utter disgrace to humanity and ones self dignity

1) public school boys in pink chinos, naughty boating shoes, club tie, sports jacket, pipe and air or superiority. RASCAL CLOBBER

2) bloke wearing boxers, sandals and a woman's crop top whilst walking the dog, unbelievable scenes and utter RASCAL CLOBBER