I'd just take my chances with mattess stitch, too. It brings the sides together, so you can try to line up knits and purls, but it really doesn't matter much. Clothing does have seams, after all.
"Trust the pattern!"
Time flies like an arrow, but fruit flies like a banana.
Hop aboard while we follow the cloud-covered van of knitting harmony, man!! Woooo!! --Hedgehog
IngridKH on Ravelry