Getting Christmas ready with River Island

When River Island asked to team up with them and create a look to go to a Christmas Party, I was like yes but what do you mean by Christmas party? I am not an ignorant, of course I've seen Bridget Jones but there is no such things in France, people might be for a drink or dinner before the festivities but they do not organise a proper party. 
That explain why my party look is quiet casual, chic but casual. I am not the kind of person who will make the extra effort to go to any party, all I need is to feel confident and for me being confident is being comfortable with what I am wearing. 
I went for a very 70's look with a python mini skirt, black turtle neck, geometric coat, pvc ankle boots and this very Chloe bag that I just ADORE! 
What do you think about that look?
What would you wear for a Christmas party?

Get the look:
turtle neck- shop X
skirt- shop X
jacket- shop X
boots- shop X
bag- shop X