Surely some of the posts to this thread are a windup. Safety aside, why should a low cost airline demand different dress standards to a low cost bus. While it seems a few of the "professionals" on this thread see themselves as something special (and they may well be), at the end of the day you are hauling bodies from one place to another.
If you REALLY think about it, does anyone who is not a "real" pilot think the typical pilot dress actually looks good?