NM! found one on amazon that can be delivered by monday =)

i have a wedding next week. i have a really cute black dress, it's jersey knit and it's a fit and flare. the problem is, it's about 2 inches too short. plus, i have a round butt so it makes it higher in the back.

where could i find a petticoat/slip that i could wear underneatn that would be a cute addition and look like it's part of the dress? gray/black/silver would be great options