I wanted an Aran design, and chose white and light blue for the pattern colours. After knitting many rows in the pattern, I noticed that the section of the sweater body after I started knitting the pattern was more than an inch narrower than the lower section, and that was with me trying to knit as loosely as possible. I didn't think the sweater would be wide enough anymore if I continued with it the way I was, and thought maybe if I unraveled the entire pattern, and inserted a bunch of extra stitches into the width just as I was starting the pattern, that the resulting 'tightness' would 'shrink' down to the actual wanted width of the sweater.
So I did, and it's working, but I lost two whole days worth of knitting in the process. Thankfully I started with the sweater body, since the sleeves will be a lot less work once I get to them. But I'm using rather short double pointed needles and the stitches kept sliding off the end. So I took two tiny elastics and wound a temporary 'knob' on the ends of the needles. Problem solved!