For a little guy it might be an idea to get a cat box and litter box train him for the winter. It's not too hard to do and dogs are attracted to the litter box anyway (the joy of being able to dig indoors). It might be an easier alternative than trying to force him to wear things he simply refuses to.
Get a litterbox and bury some treats inside it for him to root around and get comfortable going inside. If he poops in the house stick the poop in the box. He should quickly get the idea that that's where his poops are supposed to go.
Republicans, where the only children they give a shit about are the ones not born yet.