Claire, I will admit I did look at *one* second hand store but they had nothing and then I realized I was breaking my own agreement to self. And I'm certainly not going to DIY anything during one of my busiest months of the year. But I know what you mean about the popularity of the trend. There are sites dedicated to it!
SO, I'm going to proudly wear my snow top tee with my cheesy lighted necklace and my "chic" red plaid shirt and be fine with it. I'll bet no one else will be wearing stylish jeans or booties either but that's not going to change my choice. Heck, knowing the crowd, some of the people there will be wearing sweaters they actually bought to wear for the real holidays anyway.
I guess if they don't like what I wear, they can skip the invite next year.