Magic Ball of Yarn

I've been trying to finish my bulky knitted vest and realized my 'magic ball of yarn' had run out. A magic ball of yarn is made by taking a leftover bit of yarn and winding a ball; then when you reach the end, you tie it to another bit of yarn and wind that onto the ball. Each length can be from 1 yard to 20 yards long, more or less. You keep adding new colors until the ball is as big as you want. So with my new magic ball of yarn in hand, I'll use it as one of the 4 strands in this vest. So far I have one front panel and shoulder done, and now I'm working on the back. I thought I was much further along but I didn't realize the back part needed more rows added. I would say I'm 3/4 of the way through. I need to finish it while it's still winter. It's too warm for summer wear.