We had siren suits as children, (still have the photos) but they were an outdoor garment worn with wellie boots.
I remember when 'jump suits' were all the rage and I accompanied DH to the Musicians' Union Dance wearing one. It was silk, with purple and turquoise swirls and 16 small fabric covered buttons and loops DOWN THE BACK. OK when Dh was there to button me in or out of it but impossible when I went to the hotel loo after a few lemonades. I had to accost a perfect stranger and beg for assistance. She was so tiddly that it took her ages to undo the buttons and disappeared while I was in the cubicle, leaving me to rejoin the dance with a bare back under my wrap.
I swore that I would never wear another one but then bought a day wear one with a zip up the front. I happened to be wearing this when DH arrived hope from playing at 1.00am on a beautiful June night and we decided to set off on holiday (in his works van) right away, with a flask of coffee, instead of waiting until morning. Half way to Aviemore, dawn having broken and not a single other vehicle on the road, I decided I had to 'go'. No problem- stop in a layby, open both van doors, unzip and remove jumpsuit, in case it got wet, crouch down. So if you happened to be on the o'night Inverness/London train that night, which passed by some four feet away, very slowly as it was going up a steep hill, at the precise wiping moment, I do apologise and promise never to do it again.