Wow what a fabulous gown!
I wore a similar one for my prom last spring. Mine was blue but with a larger poof bottom, along with being strapless and extremely heavy. I went to the tailor to have an elastic band placed inside to tighten around my midsection just below the breast to help support all the weight of the tull. On this dress it might be wise to add such an accessory just below where the lace-ups begin to help support. If it's tight enough fit it should be fine, if not go to a tailor and have them do an insertion of a couple holes so a small strap can be inserted and wrapped around to help.
Hope that makes sense!
Again, what a beautiful dress!
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