I have no idea weither or not the Wintersday celebrations will take place in Ascalon / Lion's Arch or Lion's Arch and Kamadan or All three Campaigns.
But My idea is such: Either as a single Item: A Tuque and a Scarf (as a helm) or as 2 Seperate items such as Grenith vs Dwanya (Both as seperate "helms")
The Dark Areas are dyable, (Or Red) The White areas are white and the Scrufy places are fluffy white.
I know physics can be enabled in Helms (The Dragon helm for instance) And was wondering if the scarf down the front could have Cape-like physics or if that would be too much. Even there, there would have to be a different scarf for male and females seeing as the models are formed differently.
But thats just idea, What are yours? please upload a scetch if possible, so we can really see what you mean.

Personally I prefer the Scarf, Seeing as it would be something compleatly diferent then any other Festive item released, and we get to keep our Avatar's hair.