My version:

Reference images:

Analysis (whoo, scientific): This is a deceptively simple-looking style. I'm still not 100% certain if there is only one braid wrapped around the head or two. I think the problem is that you can do things with a fake braid than you can't with a real one. There's no obvious starting or ending place for the braid. However, the good news is that you can get a similar look with real hair. You can see in pictures 1 and 2 that the hair is pulled straight back from the forehead rather than parted as it would be if there were two braids. But you can also just barely see in pictures 3, 4, 5, and 7 that there are apparently two braids side by side behind her ear. You can also see what looks like a second braid tucked under the first one at the top of her head in pictures 4, 5, and 7. In all of the pictures, you can see that the braids are set fairly far back on her head (she has room to wear headphones in *front* of the braids in one part of the movie) and almost touch her ears. The braids are also wrapped low around her head, almost touching the nape of her neck. The braids are braided a bit loosely, and there are no fasteners or accessories visible. Picture 8 shows what the original hairpiece looked like, so we can tell there were definitely two braids and not just one.

Directions: Depending on how long your hair is, there are several ways to do this. If your hair is super long, just braid it all together and wrap it around your head. The rest of us have to get a little more creative. For slightly shorter hair, separate the hair in two sections and make two very low braids. Then wrap them around your head, with or without crossing them over behind your head first. For even shorter hair, put your hair into a ponytail and divde it in two pieces. Braid both pieces and wrap each one halfway around so that they meet at the top of your head. Either way you do it, use lots of bobby pins to hold it and position the braids how you like. That's it!