Prison dress as wedding gown

Amsterdam, Dam Square:
She and her friends were asking money from people for her wedding.
Though they are not poor people.
They told:
They live in a small village far from Amsterdam
It is a kind of custom or tradition in their small community.
They believe that it brings luck in marriage life.
The bride would like to use this dress (in the photo) as her wedding-gown!!!
No one from other cities, villages or communities permitted
to attend the wedding ceremony in her village.
To keep safe the traditions of their small community!