(translated rather roughly)
Many things are expressed in Marker costume and type of cloth: You can, for instance, tell if someone is in mourning. Costume details can indicate particular age or occasion. There is daily dress, Sunday dress, and different clothing for different celebrations. There are different gradations of mourning clothes. And there are differences in summer and winter clothing. On Marks, a lot of attention is paid to clothing. The costume consists of a large number of separate elements. All of the parts are handmade, and brought together into a complete costume with pins. Old family pieces are carefully kept. All garments are individually finished with ties and edges that have a meaning.
As with the rest of the Netherlands, costume here is gradually disappearing. The Marker costume is based on 16th century fasion. The finest expression is made in the costume of the Bride and Groom.
Important ecclesiastic occasions such as christenings, confession of faith, and communion also have associated costume. And it also follows that similar costumes are associated with Christmas, Easter, and Pentecost. In the 16th and 17th century, children began to be dressed by age, rather than as small adults. On Marks, boys wore skirts until their 6th year, but with clear differences from the clothing for little girls. After the age of 6, boys' clothing changed, girls' clothing changed two years later. They did not wear adult clothing yet, but for a year wore a transitional clothing.
Hmmm, it'd be nice to see their evidence for the progression of costume. Especially if they actually have any extant garments or pictorial evidence for the 16th century styles the modern costume is supposedly based in. I wonder if I can get them to elaborate at all.
In other news, I've also contacted Dame Christian to see if she can shed light on anything. And I'm still trying to shake loose copies of those journal articles. Might have to shell out to the NYPL for one. I think the Art Institue of Chicago has the issue of Antiek I need. The others are all limited to the Netherlands, and the National Library has not yet answered my question about cost to scan and e-mail the documents in question. They clearly offer the service, but their price scale is pretty unclear.