This section is from the book "Text-Book On Domestic Art", by Carrie Crane Ingalls. Also available from Amazon: Textbook On Domestic Art: With Illustrations And Drafts.
Altho the side gores are the same width at the waist and hip line, the lengths vary, consequently each gore must be drafted separately. The side or hip length to floor is measured on bias side of first side gore, on warp and bias of side gores, and on the warp or straight of back gore.
Use Dots as illustrated and explained on underskirt draft.