So I made my pooch a goretex shell. It is unlined, as he has sports a built in lining. I am going to make magnet-on pouches for small items like snacks while out skiing, or poo bags when in the city.
There is 1.5" velcro on the front that is bound with grosgrain. The bottom is neoprene and ~4" wide.
Super fun patterning it on him!