Here in the last semi-final, the competitors are:
This promises to be a tougher bout than the last. On the left is the French Vanilla Pullover,designed by Kirsten Hipsky and knit in a light dk weight yarn. And on the right is the Basic Set-In Sleeve Cardigan, also designed by Kirsten Hipsky, and knit in worsted weight yarn. (So either way Kirsten wins!)
My natural preference is for the lighter weight yarn, as heavier yarns add visual weight to the torso. However, all the horizontal lines in the French Vanilla - stripes, neckline, strongly contrasting pant - all carry the eye across the body and make her look wider. Look at how wide her upper left arm appears! So, the strong vertical and horizontal lines of the cardi win the day.