Hi Pandemonium
A hobble or hobbles (not sure if they should be singular or plural) is a way of controlling and shortening the wearer's stride length. Normally they are two locked bands about her ankles joine by a short rigid steel bar, or an articulated one, or a chain. Even loosely tying her ankles together will serve the same purpose with enough slack to let her take small strides.
I've also got a set that fit above the knees and which can be worn with normal length skirts (NOT Minis!). They are along the same principle as ankle hobbles - the pair I have are joined by a rigid bar a few inches long which can make walking very dfficult.
Obviously the shorter the link beteen the bands or cuffs, the harder it is to walk and the shorter the steps I can take. Hope that explains them !
Love Jane