I stole my dad's shirt in hope to belt it and wear it like a shirtdress. This was a hopeless idea though, considering the size of the sleeves.
So first, I cut straight across the torso at the armpits...
...which gave me two pieces, one of them being this. It will later be the majority of the skirt.
Then, I cut off the rest of the fabric on the back, up to the yoke.
And cut that in half.
After that, I sewed those two pieces into long tubes.
Okay, now this step is harder to explain. So, I cut one of the tubes half of the circumference of my waist. I took the second one and cut it into two quarters of the circumference of my waist. Then, I cut part of the buttoning area and attached the button to one quarter and the button whole to the other one so that they can fasten together. Finally, I sewed the quarters and the half together to create a sort of belt, which becomes the waistband.
And lastly, I sewed together the waistband and skirt, adaquately pleating.