I had that problem with Knitpicks Wool of the Andes. It's supposed to be a worsted weight. I wonder on what planet. To me, it seems more like a sport weight. Also, what yarn does the pattern call for? You can't just substitute a worsted weight for a worsted weight. Is this bamboo yarn, acrylic, wool, a blend? They each have their own characteristics and (my opinion anyway) can have a different gauge and drape differently from each other.
Welsh corgis are cool.