So I've added a few cold weather items to my Ice Cream Truck:
Second, the roads get pretty sloppy in places, so I added PDW "Dave's Mud Shovel" fenders to keep myself from getting excessively splattered. I used two front fenders ($18/ea), one on the downtube as intended, and one zip-tied under my Old Man Mountain rack ($135 for the ICT version).
And third, the 45NRTH Cobrafist pogies. These are fairly expensive at $125/pair, but they are a bargain compared to most comparable options, and designed really well. The design allows lots of unencumbered hand movement inside, plus convenient pockets and vents accessible from the inside. The idea of pogies is to allow the rider to ride bare-handed or just wear a thin glove inside the pogies, which means no dexterity loss for shifting and braking, compared to wearing big chopper mitts or lobster claw mitts.