I made this parka as an extra-warm clothing option for swim meets. My feet would often get very cold at meets, so this parka has a section around the bottom that can unfold and be cinched to create a protected air space around the feet. When walking around, the extra section can be tucked up using snaps.
I sewed this parka with a waterproof nylon-ripstop shell and polyester anti-pill fleece lining. The design is based on a combination of a standard swimming parka and a sleeping bag.