That’s my mid-Victorian ruffled petticoat which is made from yards of white cotton fabric.
Here I’m wearing the ruffled petticoat over four cotton petticoats which is suitable for the 1840s and early 1850s.

-> Dressing the Victorian Woman – 1840s and 1850s Underwear
And here I’m wearing the petticoat over my crinoline which gives a much fuller silhouette.