Butterick 6031 for stretch fabrics only. Vintage slips were always made from woven fabrics, usually nylon. For some reason, I don't find woven slips comfortable, even if there's some lycra woven into the fabric. I'm not a vintage purist (as if the purple hair and tattoos didn't tell you that!), so I decided to look into other options.
My favorite slip of all time is one that I purchased years and years ago from Anthropologie. It was a slinky blush knit that glided over the body and kept my dresses looking smooth. I wore that thing to pieces. Unfortunately, I could never find another like it! It was similar to this beautiful stretch slip by indie brand Ti Mo.
I spent a lot of time researching what kind of fabric the Anthro slip was made from and looking for something similar. The best thing I found was this fabric called Micro Stretch Jersey from Berenstein Textiles.
Here's what this fabric looks like when it drapes: slinky!
Online, you can find it at Emma One Sock under the name Venezia Stretch Lining. She has a selection of neutral colors. I highly recommend this site; I've been thrilled with every fabric I've ordered from them! (Note: the Emma One Sock listing says this fabric is a poly/lycra blend, instead of nylon/tencel. I've found conflicting info on the fabric content, and I'm not sure which is the most current.)
I also know that B&J Fabrics in New York carries this fabric in many colors. You can call them at 212-354-8150 to order.
If you prefer all natural fibers, silk jersey is a good option for this slip. However, keep in mind that it doesn't stretch as much as lycra-blend jerseys, so you may need to cut a size or two larger than normal.
Do any of you have a slinky knit to recommend for this type of design? Please share! I will be doing more research to find online options before I begin the sew-along for the slip, so stay tuned.