I generally use needles larger than what's recommended on everything. I knit at a medium or loose tension, but I just don't like using needles smaller than 10/6mm. I believe most patterns with Denim Style are on size 8/5mm. I used 7.5 mm for most of it and will now go down to 7mm for the whole thing. I think what happened here was the sleeves got caught up on something in the washing machine and got stretched out; the body wasn't so bad.
I'm not devastated about it, I just shrug and say, `oh well' and redo. It's a liitle annoying because I figured I was done with it.
edited for spelling errors