Again, what's the norm? Who's norms. . .I can tell you that saggy pants are the "norm" for a large segment of the population. . . what about miniskirts, low-cut dresses, skimpy bikinis. . . those were considered "improper" twenty or thirty years ago.
As for the church question. . . It's depends on the church you go to. The church I go to does not really care how you dress. . .their focus is on whether people show up to worship God. Also, you're assuming that the norm is based upon people who go to churches. . .
While clothing is the manifestation that triggered the discussion, the main issue is what the government should or should not be involved in. . .to me, establishing social "norms" is not what the government is set up to do. . .(see Taliban)