YOU SAID:
you're the cat's pajamas
INTO JAPANESE
あなたは猫のパジャマです
BACK INTO ENGLISH
You are in cat pajamas
INTO JAPANESE
あなたは猫のパジャマを着ています
BACK INTO ENGLISH
You are wearing cat pajamas
INTO JAPANESE
猫のパジャマを着ています
BACK INTO ENGLISH
Wearing cat pajamas
INTO JAPANESE
猫のパジャマを着て
BACK INTO ENGLISH
Wearing cat pajamas
That didn't even make that much sense in English.