When you list your home you can expect people to be walking through it. Put your laundry in hampers and organize your closets. People tend to spend more time than they should looking through your stuff. Human nature makes some people nosy. This can’t be helped.
Here’s a little video on how you can take those messy closets and turn them into something neat.
It’s not that you should be embarrassed by the contents of your closet (or should you?), it’s just that people get a bad impression of your house if they think you are not neat and organized.