The Church has lost courage nowadays and in some places is afraid to state the obvious i.e. appropriate dress for religious occasions. To be fair to the community involved in this case, in our area, they are regular attendees at Sunday Mass and probably would be one group that would actually abide by any guidelines. They bring their children to Mass not just for Communion and Confirmation unlike some of their settled neighbours.
It is a particular gripe of mine that such occasions are ruined by the carry of of the few ,with videoing etc during the confirmation or communion. Usually the most gimmicky carry on and ridiculous outfits is done by those who wont be inside the church again until christenings or wedding.