Black Dress Prep

I'm still working on the pattern for my black dress and have a fitting weekend coming up with a friend. All my fabrics are in. For the chemisette a nice, light-weight cotton. The edge of the lace will be used down the front of the chemisette, and the flat will be used on the band collar.

The black silk(?) will be the base of the dress and the silk velvet the trim. I'm not quite sure if the silk is 100% silk. I did a burn test and it seemed to melt but didn't form a gooey plastic mess. Then I soaked it in bleach and it eventually dissolved. So it's a blend, or is treated with something or who knows. But I like it and it will make a beautiful dress.