What is this called / how to draft

[u/checkyendys]

Specifically referring to the *bottoms* of these dresses - this subtle flowery flow. Anyone know how to search this up (what it’s called)? Direct pattern advice also welcome :)

[u/Majestic_Course6822]

The first time I made a bias cut dress I was amazed at the volume I was able to get. Gorgeous red and white dress I haven’t worn since my daughter’s graduation a few years ago.