Hello and thank you for your very kind answer! It does help me that tutorial you attached on your reply. But it isn’t exactly what I need, because i don’t have blue fabric under. Instead there will actually be a complete hole so you will see the skin, but that is only in the parts where there are blue outlined rectangles on the basic skirt I did. So, mmm, think about it like different strands of fabric that go as an “appliqué” to the basic skirt. (I did these ones today so, maybe that can illustrate better) and they goa along the body and some of them (the ones with the blue rectangle signs) have cutouts that go completely through. Maybe I can apply the same you did with the inverted applique but instead of having fabric under i would not have anything so I will just do the same tuck you did, but I think it wouldn’t really look as clean because there would be two tucks since the fabric strands are actually made out of two layers of fabric sewn together. What do you think it is the best method? I am quite frustrated since this must be done very nicely for university, but well, I am sure sewing is just like any other thing, a process in which you get to know your way more and more since you fail and try.   Cheers!

got it.   I agree with rdejam that an interfacing  would be a good idea.  You can try on a scrap and see if the reverse applique gives you the look you want (minus the fabric underneath) but still turning under the same way.  You can also, after you do your cut out, see if you can use a ribbon or trim to just fold over the raw edges of each cutout.  That way it’ll look finished with no fraying.  After you do the cutout, I would apply a little bit of fray check just so it doesn’t fray before you get to it.   I’m interested to see how you accomplish this so let us know what works best for you.