I would imagine that a section of garter stitch, which is what you knit would be perfectly ok. Ribbing is generally used because it pulls in a little, but what you have, I'm sure, will be fine.
When you do ribbing, it's very important to bring the YARN between the needles between your knit and purl sections. Have it in the back to knit, then bring it to the front between the needles, to purl. After you purl, put it back between the needles. It's a lot of switching back and forth, but that's ribbing for ya.
Edited to sound like a sane person wrote it!