The first part of this project was figuring out the pattern. The dress from RTBU has a princess seam, but I thought darts would be easier, and I've seen similar projects that didn't use a princess seam, like this one
To save myself some time, I unpicked the seams of a shirt that I had lying around, and traced it to make my pattern.
That's what I got. I just placed tracing paper over the top and traced what I saw. The darts were a little tricky to see, but I managed all right. I think this type of diamond-shaped dart is called a French dart.
I got lucky with the sleeve pattern. The sleeve is a puff sleeve with some flare at the cuff. I am basing my design more on Vlad's sleeve than the RTBU sleeves. I already had a puff sleeve pattern, so I simple made it long enough for my arms.I haven't made the skirt yet, but it's just two or three circle skirt with horse hair braid on the hem, and gathered at the top. You end with with a very ruffled skirt, sort of like this one:
Such ruffles. Much horse hair braid. Many sewings.
I'm going to use cotton poplin for this, mainly because it was inexpensive and has a matte appearance. I've washed it to prevent colours running (that happened the first time I washed my Sailor Mars skirt: everything went pink) and to stop the material from shrinking when I wash the dress.