Not sure if this is still helpful, but it's each time 5 cuts per tutu layer, I believe the reason she sais 8 bundles, it's because she'll make 8 tutus.
I am making a tutu for my 8 yr old granddaughter (waist about 20") how long (you were cutting them 11.5" graduated down with 5 strips per tutu would you recommend narrower width and shorter length?
It's called a ruffle foot or tucking foot. Most machines offer this as an addiitional attachment you can purchase. You have to sew slowly with it, beware. Hope this helps.
Tenho um pouco de experiência em tutu., já diz para cia de balet São José dos Campos SP. Sinto um grande desejo de me especializar Por isso acompanho suas aulas Sonho em u m dia trabalhar ai com vc. Sou muito caprichosa e muito dedicada. Mas financeiramente sem condições Mas Se for para ser será.