Where can I find a long black goth slip?

I need a long (at least 37″ from waist) black kind of goth looking slip that will show under a dress & long black crocheted sweater-duster thing. A ruffle or something at the bottom would be ideal. Cotton would be great but I’ll take silk, nylon…whatevever. It can be a full or half slip. Any ideas where I could find one? Thanks!

I got an awesome slip at a thrift store and a duster at Macy’s back when they were trendy. I would try the Salvation Army for both. My slip is amazing. I think I’ll wear it tomorrow.

Crocheted Scrubbies- Pot Scrubbers