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1.
To prepare oneself for the outdoors by adding or removing layers of clothing.

In wintertime, the word "winterize" may be used, instead, to more specifically define the act of preparing oneself for the cold winter weather outside by putting on one's coat, hat, scarf, boots, and/or gloves.
Sam and his friends are about to go outdoors, but he hasn't finished getting himself ready clothing-wise.

Sam to his friends: "Hold on guys... I still need to weatherize!"
by supernova4 December 18, 2011