Yes I remember these bloomer style rubber panties. Years ago there was always an advert in the Sunday papers for them. when I was older and could drive I was on business somewhere up in the north of England and I sought out the seller and called on him to buy some. He operated the mail order business from his home and was nearing retirement and wanted to sell up. I only wished I'd had the money to buy it at the time. Not long after it disapeared and the ads stopped. I think the pants were made in Malaysia where a lot of rubber wear was produced at the time. They certainly beat the moulded stuff that followed because of the clever way they put the waist and leg bands on so that they gathered evenly. This must have been machine done. Maybe one day I will have a go at making some, the rubber sheeting comes in many colours and weights and can be got from the Four D Rubber company in the UK (www.fourdrubber.com/).
Marcia