The feet MUST stay just outside the hips. The reason for this is to allow the hips to squat right in between the heels. This does two things for the lifter. Firstly, it keeps the lifter upright and maintains a vertical torso. Second, it allows the lifter to keep their hips under the bar which allows the bar to be more stable over the center of gravity.
Often you will find athletes try to go too wide with their feet which compromises their depth and prevents their knees from tracking over their toes. Furthermore, you may find athletes struggle to complete an OHS when their feet are too narrow. A narrow stance requires extreme ankle and hip flexibility and will create more problems for those without such capability.