Is this a bad idea?

My boyfriend and I have been together since we were 15. We are now 22. We are discussing marriage. We went to prom together in 2017 and I honestly want to wear my prom dress as a wedding dress just because it means so much to me/is sentimental. The dress is royal blue on the bottom and cream on the top. It does not look like a wedding dress at all, it definitely looks like a prom dress. Is this a dumb idea?

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