A sequin skirt is not only for Christmas.
In order to avoid abandoning your sequin skirt and to wear it the rest of the year, without looking like a Christmas tree, you could:
Add a turtle neck sweater

J.Crew COLLECTION CASHMERE CHUNKY TURTLENECK SWEATER beige
a white shirt, with or without the turtleneck

J.Crew FAVORITE SHIRT white
a pair of flat ankle boots
a pair of brogues
a t-shirt and cardigan
a pair of thick wooly tights
TopShop Sequin skirt, J.Crew Turtleneck sweater, J.Crew white shirt
E.