A college or university diploma

Who do you think you are? Maybe I'm not as clever as you, but I too have my own sheepskin

Ma chi ti credi di essere? Forse non sono un genio come te, ma anch'io ho il mio bravo pezzo di carta

To find a good job your sheepskin is not enough, you need experience too

Per trovare un buon lavoro non basta avere un pezzo di carta, ci vuole anche esperienza

Until the advent of printing, parchment was the principal material of book pages. Even after paper of good quality became abundant and cheap, parchment continued to be used for very important documents, such as land deeds and university diplomas. American students originated today's slang meaning of the word for diploma