It's highly possible that it is NOT Idina's dress, but the reason my aunt and I thought it was is because they were highlighting Susan Hilferty's Tony Award winning costumes, so we figured, if that's what they were doing, why not display a costume that she actually won for. I hope that made sense.
Question: if it IS a duplicate, wouldn't it also be Idina's dress? I mean, if they have duplicates because of "wear and tear," then it is very possible that she also wore the duplicate, right?
"Blow out the candles, Robert, and make a wish. Want something. Want something."
Wishes come true, not free.