Sleeve Movement
About 150 years ago (376 gnome Years), a witch named Nora Blacktree from Oakbury, CT began sewing sweaters for little dead squirrels she was finding in her garden, most of which were being killed off by the stench of an overgrown tomato that sit in the corner. The witch had cast a spell on the tomato while planting it but being at the frail age of 163 (via another spell), she completely forgot and just let it grow and grow until it drew in all the squirrels in the neighborhood and subsequently killed them. Feeling bad for what she had done, she felt as if sewing them sweaters would help, but clearly, it did not.
Where Are They Now?
Ms. Blacktree's sweaters can be found on display in Oakbury's Museum of Ancient Art, resting in an encasing designed by world renowned architect Theodore Braxton, who helped design Mars and the earth's second invisible moon, the one not made of cheese. Her sweaters lie next to her dead body, which was never buried nor mummified, so as a result the museum does not receive many visitors. In fact, nobody has even really ever tried to verify its existence, so it could just be that these little squirrels will freeze forever.
Sleeves and Witchcraft
Witches have since abandoned the art of sweater making to make time for brewing stew and decapitating baby rodents but their work will never be forgotten, except by those who don't own a sweater of theirs, in which case you would be doomed to a life of freezing cold, and while I'm no expert in the field of cryogenics, I'm willing to bet that this is no good.