A couple of friends and I worked on this a month ago, the guy in the top right corner is satwkid's oc, the girl in the top left corner is my version of Finland, and those two at the bottom are canon characters
It takes approximately 1400 meters of yarn to make a simple sweater and at least twice that to knit a "fancy" one. It also takes 4pounds of clean fleece to make the yarn.
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