I was using Patons Decor. The yarn was fine, my gauge was good, but I chose a size too big AND I did something really retarded.
I didn't really want all the ribbing at the bottom (okay, truth is I didn't want to DO all the ribbing!!) so I just kept on going in stockinette, I was afterall trying to duplicate one of my very favorite shirts that I have, but I would not recommend doing what I did because the row where the front left and right sides are joined, there was an obvious line there when all was said and done because I didn't start the ribbing there like I was supposed to. It was very conspicuous and ugly and I KNEW I wouldn't wear it like that so I frogged it. If I actually decided to knit it again, I would use the recommended yarn and I would make a size smaller and follow the directions!! :D