The good news: I've started working on the tutorial! I'm 3/4 finished, it'll really be up soon!
The bad news: This is supposed to be a zig-zag stitch.
My machine only has one speed at the moment: SUPERFAST. Which I should have fixed back home, but I didn't because I sort of got used to it. Now it's really annoying because with this fabric (very pretty heavy weight teal jersey) it keeps skipping stitches and slicing the thread. I've tried all the different needles I've got, different tensions, but to no avail. When I was ready to throw it out of the window, I took a break (tea and chocolate, always helps) and then dissected the presser foot.
I couldn't find the problem, so I guess I'm stuck with it. Good thing that this skirt has no visible seams on the outside...