One of the two latex dresses Jennifer Lopez was wearing in the L’Oreal commercial (see the videos below) has made its way on eBay and can be found here.
The copper-toned latex dress is made by Atsulo Kudo, has a zipper with two sliders in the back (so you can have a slit of any length). The dress does not list a size, but J Lo says she has been a size 6 for the last decade.
Anyway, below you can find the behind the scenes hi-rez video with interviews, still images and photos of the dress with the certificate of authenticity.
Behind the scenes: