First, take some measurements. I've included mine for comparison; I'm 5'7" and relatively thin.
1) measure fully around your shoulders. Mine measured 44"
2) measure from the top of your head, around the curve of your head, to your neck/shoulder area... however you want your hood to sit. Mine was 14"
3) measure the length of your tassels, from about the breastbone to the ankles. I went for 47" ish ?
Here's a photo of what I mean.
Then, acquire some non-stretchy fabric. I needed about two yards of 44" width fabric. If your measurements are vastly different from mine you'll probably need to do some math about your rectangles.
Then, cut the shoulder rectangle.
Width: half the shoulder measurement, + 1" (mine would be 23")
Fold in half over the height, then the width. Then, cut out a neck hole from the middle and adjust as needed. I made my neck hole about 8" wide and 1" long in the back, but about 4" long in the front. Finally, cut the front in half so it opens over the chest.
I also used wrapping paper to pattern before transferring it to the fabric.
Now you sew the shoulders using the ancient measuring technique of "eyeballin' it".
With the fabric folded in half over the height (wrong side out), place the fold oriented up. Sew a smooth curve from a couple inches from the neck hole to the bottom corner using a straight stitch. (Or, pin first, then measure, then sew.) Repeat on the other shoulder, using the first shoulder as a guide.
Below is an image of my finished stitches.
Next, measure the circumference of the neck hole. Mine was... idk 20" or so?
Then, cut the hood rectangle.
Width: circumference measurement that you just took. (If you want the opening of the hood wider in the front, subtract a couple inches.)
Length: height of hood that you measured earlier + 1" or so
Place the right sides of the shoulder piece and hood piece touching each other, and pin the circumference-edge of the hood to the edge of the neck hole. Make sure it is centered on the back of the hood/neck. Sew, leaving about an inch of hood unsewn on either side.
Then, again using the infallible technique of "eyeballin' it", shape your hood:
Fold it in half (such that the neck seam is folded in half). Place the seam downwards. Sew along the top of the hood, then downwards in a smooth curve, leaving the entire front open. Pictured below. (I think I would have done a longer straight segment on top before starting the curve, especially if you want a deeper hood.)
Now it is time to make the hood and top look nice, while it is still small and manageable.
Cut the excess fabric from the hood and shoulders; I left about 1/4" next to each seam. Optionally, iron flat.
I did a rolled hem along the entire exposed edge: fold the hem inward, then fold inward again, then very carefully pin and sew around the entire length. This will make the stitch visible on the outside.
Here is the same hem outside:
To get those sharp corners on a machine, sew one line, then stop. Sink the needle into the fabric. Then, lift the foot. Turn the fabric with the needle still inserted. Lower the foot and continue.
I also added hook and eye closures; add your preferred closure.
Cut one more big rectangle.
I just used the entire width (44") of my fabric, and cut the tassels height I measured.
Pin the short edge to the bottom of the shoulder piece, with the good sides touching, centering it on the back. It probably doesn't go all the way across the front, but for a Mistcloak that is ok. If you need more width, you'll have to composite it out of more fabric... which unfortunately will add significant fabric requirements.
Sew along the length. I added two rows of stitching because I wanted it to be very secure.
Then, cut strips—stopping about 1" below the seam.
I made my strips about 1.5" wide. I also spent a lot of time ironing in creases to give very straight guidelines.
This is my own pattern/instructions. The cloak itself is based on descriptions from Brandon Sanderson's Mistborn. You are free to save and share these instructions, as well as make garments using them; please do not claim the instructions as your own. Please do not sell garments made using these instructions (which I think would also be against Sanderson's IP/copyright rules.)