First of hopefully 3 tutorials for Toph's Fire Nation disguise! Here is how to make her bracelet/glove thingys.
I reference a lot of different sewing techniques here, so here are some helpful links:
How to applique with heat n' bond:[link]
How to make your own bias tape:[link][link]
Applying bias tape (use the first method in this link for this tutorial):[link]
Enjoy! If you have any questions, let me know!