Christmas in October

Contemplating whether I should buy myself this dress for Christmas. I hate walking away from things and then constantly thinking about it after. Its a sure sign that I need it in my wardrobe. But when I wore this dress it felt like I was going to prom... Imagine the dress without the bra straps, of course. What do you think? Does this look too much like a prom dress? Or could I wear this to Christmas dinner?

Z Spoke by Zac Posen dress, Nicholas Kirkwood snakeskin pumps, Jacob & Co. watch