William Gibson's blogged this wonderfully weird passage from Ivan Bloch's 1903 "Sexual Life in England," about the sadly defunct practice of London ladies going about with fake pregnancy bumps made of tin strapped to their middles. The fashion ended because practical jokers made the "tin pinafores" the butt of their jokes, and was successfully transplanted to Dublin!
Further, in the course of the eighteenth century, the peculiar fashion of false stomachs, 'pads' or 'paddies', was revived. These were used for a time at the end 'fifties, and were seen again in the 'nineties. Archenholtz says: 'This was the most senseless invention, against all decency and delicacy, and disfiguring the female body; it caused a deformity which is only seen in the female sex during pregnancy. These decorations were called pads, and the smaller ones paddies; they were usually made of tin, and were therefore called "tin pinafores". These artificial stomachs were in great favour, particularly with unmarried women, which caused the wits to say that a revolution had taken place amongst the signs of the Zodiac, and the Twins had come too near Virgo. But above all, these pads were the butt of jokers, who used them unmercifully, and their use soon had to be discontinued. Such a fashion was in too bad taste to last long. It was in existence in London in February 1793, but by the end of the spring it was over in England and went to Dublin, where it was welcomed by the women. During the migration which took place as a result of the French war, it was taken to Germany by refugee English women, but was not copied there.'