Re: Or turn a woman in a bikini into a beach ball
" These are normally only worn by elderly gut-overhanging people [...]"
No swimming costume short of a whalebone corset will conceal such overhangs.
Nowadays obesity seems to set in at an early age in the UK. Many elderly men have a figure that is much slimmer than younger ones - the habit of a lifetime.
Speedo briefs went out of fashion in the UK because the USA long-shorts fashion covered a "moral panic" about young male bodies. Other European countries were largely unaffected.