The Queen's English - "The bee's knees" and "The cat's pajamas" are both English slang phrases. The Oxford English Dictionary records the expression "bee's knee" as meaning something small or insignificant from
U.S. Embassy Issues Apology After Sending Invites To 'Cat Pajama-Jam' - The Dodo
5 Popular Cat Clichés and Sayings: What Do They Mean? - PetHelpful
iwrestledabearonce – The Cat's Pajamas Lyrics | Genius Lyrics