I'm using Prusa Mendel Rep-rap. It's kind of a 3d printer for do-it-yourself. It prints, layer by layer, with plastic like a very tiny glue gun (you can see the lines from the layers in the photo). The Rainbow dash was printed in 1 piece, and a lot of support material was printed to support the overhanging sections (belly, head, tail, etc.)
With the fact that it stays on longer, a hoodie is much like a blanket. And it's kind of common to wear socks to bed, and a lot of people do it in the winter. You should probably use clean socks for grooming, not those that have spent the entire day in your boots and foot sweat.