A subtle yet effective manner to restrict the movements of your girl slave is to have her wear a uniform with suspenders, or suspenders and bib, tightly enough so that she feels tied up and she is not able to pull the straps down.
In some schools for girls it is mandatory to wear for a uniform a skirt with two straps that cross in the back and go over the shoulders and attach to the front. Also a jumper type is worn with a bib that covers the chest and straps that cross in the back.
This uniforms are not comfortable, but rather tie up the student, and the fact that many students pull the straps down to the sides of the hips after school is enough to see this. They feel the pressure in their shoulders, back and chest, and there is also the fact that they are not able to pull the tails of the uniform blouse outside the skirt if they have the suspenders on.
If it is true that standing the bib and straps may be somewhat loose it is so that when they sit that they start to feel the bondage, because the skirt is then caught between her ass and the seat causing the straps to start pulling from the shoulders, like if they were ropes!
These uniforms are most common for little girls therefore adding humiliation to the more grown wearer. Also the bib type resembles aprons that are used by maids which makes them feel like servants. And in that way they must stay for the most part of the day and week! Tied up and uniformed like maids.
The straps can also be used to tie the girl slave to the seat, passing them through its back part before tying them to her shoulders.
If a tie and a blouse that buttons up in the back, where she canīt reach without help, is also part of the uniform, then the humiliation will be greater.
In Peru many girls have to wear this uniform, also in Cuba, and in other many places, specially Japan.