I don't fully understand your question. Is this a apres ski themed party or are you going to an actual ski area. We ski at places like vail and deer Valley regularly and the attire varies pretty widely. For the locals it is jeans, boots and ski jackets. For the very rich latin crowd it's black pants, beautiful fur or leather boots and usually a fur vest or jacket, along with beautifully blow dried hair. For schlumps like me it's jeans, uggs and some kind of nordic sweater.