Look morons; If you are referring to an article of clothing, then yes the arm is called the sleeve. If you are referring to a tattoo, anything that covers a particular part of ones body is called a sleeve. I don't get why everyone is so dumb about this...
i dont know if full leg pieces have always been called sleeves but wtf else am i gonna call it? it would sound pretty fucking retarded if i called it a pants leg now wouldn't it?