I found this...I'm still a little confused though.
"The 4 X 7 sts consists of the 7 sts cast on at each side of both sleeves. Each sleeve had a total of 14 stitches cast on. (Are you still with me?) The total sts cast on for both sleeves together equals 28. 4 X 7 = 28 (At that moment, a light bulb went off.) Basically, you are picking up 7 stitches at each end of each sleeve. In other words, you are picking up 7 stitches 4 times. That's where 4 X 7 comes in. Now, why Mrs. Zimmerman couldn't say that to begin with, I don't know. Nevertheless, I still love this pattern and would difinitely knit it again."
I think what it means is I go back to knitting the body of the sweater and then when I come to each sleeve, I pick up only the cast-on sts and continue. Then I stitch the sleeves shut to form a tube? Is that it?!