YOU SAID:

I've always wanted to wear a catsuit with a picture of a cat wearing a catsuit with a picture of me on it

INTO JAPANESE

私はいつも猫の写真にキャットスーツを着て、自分の写真が載っている猫のスーツに着たいと思っていました

BACK INTO ENGLISH

I always wanted to wear a cat suit on a cat picture and a cat suit with my picture on it

INTO JAPANESE

私はいつも猫の写真に猫のスーツを着て、私の写真が猫のスーツに着ていた

BACK INTO ENGLISH

I always wore a cat suit on a cat photo and my photo wore a cat suit

INTO JAPANESE

私はいつも猫の写真に猫のスーツを着ていて、私の写真は猫のスーツを着ていました

BACK INTO ENGLISH

I always wore a cat suit on a cat photo and my photo wore a cat suit