Vintage 1920s to early 30s full slip. Ivory rayon with ecru lace trim and with tiny adjustable straps. It has a double layer of fabric in the front lower panel. This is a rare larger size for 1920s/30s . It is in excellent condition apart from one tiny faint spot on the lace at the upper back, shown in last photo.
No size tag. No maker's mark. The measurements listed below were taken while laying flat and doubled where appropriate.
Shown on a US size 10 dress form with the bust clipped for shape otherwise it would have been difficult to see the detail in the photo.
Bust - 44 inches (111.76 cm) Waist - 40 inches (101.6 cm) Hips - 46 inches (116.84 cm) Length from top of lace fabric in front to hem - 44 inches (111.76 cm) - not including straps