Hi, I want to order the Kenneth Cole New York Marabelle sweater but I'm unsure whether to get an M or an L. I want the grey colour which is currently only available in a Large, and I *think* I recall fitting the size 10 Kenneth Cole coats that were at Costco last year. Will the 10 be too big?

For reference, I'm consistently a Medium/8 at Gap, and a 10/Large (sometimes 8) at Banana Republic.