I was thinking about this yesterday, I'd just put on my size 14-16 pyjamas and the top was a generous 16 but the trousers must have been nearer a 14.
I'd rather have a 16-18,but the shop doesn't do it and the 18-20 drowns me.
Why do shops even do this, there's 2 inches between the sizes so surely the item cannot fit both.