First of all your gown is gorgeous!!!! Secondly even though I am doing our TTD in my dress I am not wearing it again. I guess because your grandmother bought it and you are wearing it for your AHR where she will be I would go with wearing a different dress for the TTD just to be on the safe side. IF you are too worried about it you may not do what you want for the TTD (like roll around in sand or get crazy in the water, etc). JMHO