@ElectricKeet I have had good luck with Wilson's Leather Outlets in the past (in meatspace though). They have sections of women's not-leather coats in the back that goes up to 3x/4x.
@somekindofcrow 3X/4X talls? It'd be nice to have sleeves that approach my wrists instead of giving up two-thirds of the way down my forearms. :)
@ElectricKeet I am not sure. The ones I have generally have sleeves that are slightly too long for me, but I'm a few inches shorter than you so. :3
@ElectricKeet You're welcome!