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Some of it maybe to communicate that you should be dressing for day rather than evening wear because weirdly sometimes girls this age don't discriminate in outfits.
(I'll see stuff sometimes at the school where I work and wonder if they thought they were going to a night club.)
The other aspect I can think of is that even in later rounds, with the exception of prefs, you might sit either on the floor or on a metal folding chair. In either case, beads might be really uncomfortable and impractical.
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