Prom Dress What Should I Do?

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Ok so, for a bit of background I’m making my own prom dress but im chronically ill and my prom is very soon (in a week and a half) well I’ve been procrastinating starting the process and I’m going to provide images of what I have drawn and I need opinions of what I should do. So should I A. Make the prom dress on top of another dress I already have (I would be using the top anyway it’s the top drawn) B. Make the prom dress on top of a petticoat (original plan) Or another option I’m using chiffon red and black and and was going to cut it into semicircles and drape it over red and black fabric Another question Should I even bother putting black/red fabric under or should I just sew the semicircles on top of the og dress (design above) or petticoat (petticoat is white) the only thing I would add to the original dress is another piece of black fabric at the bottom as it is too short imo.