Fashion Math: Sweater shorts?

After a bout of Lake Effect Snow and a very cold New Year's Eve, I've apparently caught a head cold right before I have to go back to substitute teaching. Amazing timing,

Since it is so cold, it's only natural that I feel the need to be extra cozy and layer up on thermal underwear and sweaters and six throw blankets. It's January. Everyone feel like that. However, I feel as if Forever 21 hasn't quite gotten the right idea about sweaters...

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Posh Spice rocking the sweater

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Sweater Shorts

Joseph and the Amazing Technicolor Sweater Vest

Forever21 - Rainbow Toggle Cardigan

I swear I've seen this before, but I can't think of where. It's not like I know anyone who would wear a rainbow sleeveless sweater-


Oh.