Something about the waistband looks very familiar to me too, but I can’t quite place them… Like you, it could be something I remember from holidays abroad.
I think the Sainsburys Stages nappies from about 1991/92 were like this but with a blue waistband. It’s possibly just that. Maybe they were made by the same company.
I was racking my brain to think whether it might have been one of the supermarket brands, so I think you’re on to something there. The green does seem familiar though… If I find anything, I’ll let you know.