Sweater weather and what else to wear?

Everytime I look in the calendar these days I just cannot believe that we are a few days apart from Christmas and New Years Eve! Time has just passed by without notice and there are still lots of things to do, plans and whislists to fulfill and outfits to decide! I do not know how you are doing it guys because in what regards myself I think that sometime I just cannot manage enough the time I have got... I wich one day would be longer than 24 hours but those extra hours would still not be enough to make everything right. In the few moments I have got free from my lunch break I am trying my best to get gifts for the loved ones and plan the meals for our Christmas party. Well, most of the cattering and partying supplies will be done mostly by my mother but I do want to make sure that I help my family with everything I can. I have already bought lots of gifts a long time ago for my brother and sister but I stillhave to decide what I am going to wear this year. My girlfriend has already chosen a few outfits and keeps on sending me pictures with cute sweater ideas she will wear for the following days so I guess this is her way of telling me to either hurry up or match my outfits with her... Some look like these in the following pictures andI know for certain that she has bought it online from Chicgostyle but some are really ugly and I am wondering if those are a joke or if she is serious?!

Crew Neck Bowknot Cutout Patchwork Crochet Plain Sweaters & 

Knit Sweater V-Neck Stripe Sweater

Open Back Two Sexy Sweaters & Fashion Plain Long Sleeve Knit Sweater Casual Dress

 Well I would not mind to wear a matching outfit but I think she wants to make sure that I have everything done in time and I do not blame her considering I have the worst timing! But guys, what do you think I should wear if she opts for a more comfortable look like just some women knitwear apparel? I think a suit would look to formal while a tracksuit way too boring... Actualy, if i have a closer look to the outfits she has selected i think it will all be casual so I will go just like that with a jumper and a pair of jeans maybe.... I am so confused and so not good with fashion! I do not know what I will be wearing but I do know as a fact that if I do not have it all ready by the end of this weekend, I will be in great danger!