The context of the following conversation is Alex was about to make meatballs but he didn't want his sleeves to get dirty so he rolled them up.:
Alex says I was making meatballs the other day..
The friend responds How did they turn out?.
Alex responds Pretty well. I was wearing an old sweater while making them..
The friend responds Yeah, why an old sweater?.
Alex responds I thought it would be messy. But the sleeves of an old sweater won't stay up unless you roll them up..
The friend responds Yeah, that will do the trick..