Wow, that's a lot of dots. We call them polka dots here in the U.S. Is there any vernacular term for them used in Europe?
My one thought is that older dresses in polka dots tend to look a lot more dated than solid colors from the same era.
The Dutch words for dots, well for my surroundings, is
stippen (small:
stipjes) or
punten (small:
puntjes). Of which the first one is the most common.
The dots as seen in those US outfits of the 50s, similar to those often worn by Diana, are often defined als polka dots. Depending to who you speak to.
BTW the Dutch word for dotted would be
gestippeld or perhaps even
gespikkeld. But the last one indicates very small dots.