While it's possible, I doubt that there are many organizations with a national policy like that.
However, on the chapter level, I'm sure that there is probably a fairly sizable number (though still probably a very small %age) that do.
As for a full pledge period with formal attire - that's probably impossible. Too many kids wouldn't stand for it. There were chapters at my alma mater who required formal attire during their I-weeks, but one week is a lot different than several months.
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"I address the haters and underestimaters, then ride up on 'em like they escalators"
- Abraham Lincoln
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