From Peggy for the surprise me RR. She writes that Delft Blue is a typically Dutch form of art, and that these are traditional costumes not often seen anymore except to amuse tourists. Thanks Peggy for the card and for these old, awesome stamps:
A stamp from 1996, and one from 1991 showing Pieter Zeeman, nobel-prize winning Dutch physicist.
This one is from 1995 and shows the World Scout Jamboree, which was held in the Netherlands in that year.