Arianna said it best at Thursday's holiday party: Like a tree with rings, you can tell how long a HuffPost staffer has been with the company by the number of sweaters they own.
Holiday sweaters, that is -- in 2007, Arianna started the tradition of gifting staff with sweaters every December, and we've been going strong ever since.
Check out the History of the HuffPost Sweater -- all six years -- below!
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