I own that dress and my body is not nearly as hot as yours and I look amazing in it. BUY IT. And totally wear it for holiday cards. No Regrets Chicken for sure.
Love the dress for something else. I have similar ones from Lands End in black that get a lot of use. I have both long and short.
I sometimes do a gauze scarf and jean jacket, blazer or print cardigan. But TBH, the short one attends a lot of funerals lately. If I were working with an estate planner, a solid black dress might feel a bit ghoulish and funereal.
I like the dress. Do you like scarves? Adding one could bring in some color and make it more holiday-ish, while also providing coverage if the dress is too low cut. A jean jacket could also be cute with this dress.