By dead people, do you mean a corpse? If so, when my dad died, we bought a suit from the funeral home because my dad's suit no longer fit him due to the weight loss.
I recall the suit was something like out of the Johnny Carson collection, which was my dad's style, and it was pretty reasonably priced. They made him up real good, too, for being dead, his face nice and tight like Burt Reynolds after the facelift and Botox.
I'm hoping to take a pass on cancer, and I'm opting for cremation.