I am involved in a bit of amateur acting and as it will be in winter and possible very cold I need very warm clothing. I have long sleeve grey cashmere sweater dress with a high neck. It reaches to my ankles. The cashmere is not very thick, but I also have a black cashmere crew neck cardigan which is very warm. The cardigan reaches to the top of my hips. Would it be a faux pas to wear it on top of the cashmere sweater dress?