The Bruins and Penguins understood the assignment.
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In what has become an annual tradition of Winter Classic teams picking themed outfits, Boston and Pittsburgh players both arrived at Fenway Park Monday morning donning throwback baseball uniforms -- the Bruins in Red Sox attire, the Penguins in Pirates gear.
The Bruins proceeded to "warm up" by tossing some baseballs around next to the ice.
Check out the arrivals below: