The main feature of the Corselet Skirt was a high waist worn just beneath the bust with no indication of a waistband or belt.
With minor variations the blouse and skirt dominated young women's fashion before and during the Great War.
Some Corselet Skirts had a thick seam/opening running from waist to hem.This seam was worn at the centre or to one side.
Skirt length was usually worn somewhere between mid-ankle and mid-calf.

....and a white skirt in the new corselet style, beltless and fitting tightly right up to the bust----my uncles said it reminded them of a horse blanket.

from "Look Back with Mixed Feelings" autobiography of Dodie Smith

Above date about 1917: Age about 16 years old  • Estimate: born 1901 ± 3 years

Inscribed :Mum with love from Ruby