http://www.core77.com/blog/object_culture/hoodie_origami_fold_your_sweatshirt_into_a_laptop_bag_baby_carrier_etc_16131.asp
I haven't yet fully got my head around this - for example, in that video, where does the hood go? The only hoodie I own doesn't have a zip, either - I worry this may be a problem...
Still fascinating, though.