Ideally you would make the undergarment first and the outer garment second. But the lure of pretty fabric was too much for me, so I made my 1920s One Hour Dress first. Having made the dress I recognized the need for an appropriate undergarment to smith any wrinkles and reinforce the correct silhouette. This is, after all, the 1920s, and the garçon look is all the rage.
I started with the same 1 hour dress pattern I made using the tutorials from The Closet Historian and a few yards of white cotton batiste. The cotton batiste is more stiff and less drapey than the rayon used in the outer garment, though still very lightweight. I did a quick fitting and took the side seams in by 3/4 inch each side (this makes the final garment 3 inches smaller in total compared to the outer dress). I sewed up the side seams using French seams and sewed the pleats in place. My batiste was 45″ wide (vs. the 60″ wide Rayon I used for the dress), so I used the full width of the fabric for both front and back of the slip.
Time for another fitting: I angled the neckline to be 1 1/2 inches higher in front than in back. This also makes the garment more comfortable around the underarm. Finally, I created 1” wide straps from the batiste.
The last thing to do on my slip was apply lace. I had bought 5 yards of cotton lace several months ago with the vague idea of making a blouse or a petticoat or something. I used the lace to finish the neckline and hem and to cover the raw edges of the side pleats (the lace is on the outside of the slip, whereas the lace finishing is on the inside of the dress). In the end I had about 2 inches of lace left, which was super satisfying.
I am quite pleased with the finished garment. It’s simple but effective, and the lace is so lovely. If I was making this again I would stack the side pleats so they weren’t quite as wide (it would look like a knife pleat on either side of the seam with a box pleat stacked on top).
The fabric of the slip is rather sheer so I won’t post full photos, but here is a side by side of the outer dress without a slip (left) and with the slip (right). It doesn’t make a huge difference, but does help control wrinkling. And since the dress is made of a delicate rayon, the cotton slip will help to minimize contact between my body and the dress, keeping the dress clean longer and extending its life.