Black Milk Clothing Periodic Table vs Mathematicool Inside Out Dress size M. This is a completely revertible dress with two different prints on either side. Fabric is 82% Polyester, 18% Elastane. I am the only owner of this piece, the original Black Milk branding tag was removed by me to be able to wear this dress both ways. Dress has been worn multiple times, but has been cleaned and kept in excellent condition in a smoke free home.