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If you had walked into the toddler room and a child was on the changing table having a diaper changed, would you have been shocked?
Preschoolers are still potty learning and not all of them can be safely left in the bathroom with the door closed. They may need help with personal hygiene or dressing, or they may behave inappropriately, such as climbing on the sink or playing in the toilet. If a child were hurt while alone in the bathroom, the program would be held liable for lack of supervision and could be sued. Thus, it is not uncommon to have preschool bathrooms without doors.
At this age, girls and boys tend not to be self-conscious around one another at all unless adults make it a big deal. They really don't even seem to notice.
It also does not concern me that the teacher allowed the little girl to figure out redressing on her own. Many preschoolers have an independent streak and can learn to do things for themselves with time and patience.
The one thing about your story that DOES bother me is that your husband was directed to take your child's coat into the bathroom. No adult who is not a part of the staff should be around any child (other than their own) in the bathroom. Children's belongings should be stored elsewhere.
The program might also think about using a tension rod to hang a washable shower curtain across the doorway at a height that would allow teachers to easily check on children, while giving children a little more of a sense of privacy and freedom from interruption. At their height, it seems like a door and they can learn not to go in if the curtain is closed, but it doesn't compromise supervision.