Vanessa
I mean, Vanessa, further the decision of wear it or not.
Let me an example:
You can choose make a diet or not, but if you are on diet you, for example, should not eat bread.
Can you eat bread? Yes, but the you are not on a diet then.
Chastity belt the same, can a girl be keyholder? Can a girl have the key? Can a girl to decide when opening the belt?
The answer is yes, but then, she is not wearing a chastity belt.
A girl can choose to make a diet or not, but if she chooses diet, then she can not eat Nutella sandwiches.