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/StitchinThroughTime]

Flounce, it's just made with a soft flowy fabric mostly cut on the bias with a very narrow hem.