What did Lennie lose that he wishes he had now?

From the text:

Lennie chuckled with pleasure. “You bet, by God,” he cried happily. “An’ I had some, too. A lady give me some, an’ that lady was—my own Aunt Clara. She give it right to me—‘bout this big a piece. I wisht I had that velvet right now.” A frown came over his face. “I lost it,” he said. “I ain’t seen it for a long time.”