Contrary to safety PPE, clothing worn in cleanrooms acts to protect the environment from the wearer.
Cleanroom gowning technique
As you gown, particles from your person will be disturbed and will naturally cascade down. To prevent these particles from landing on clean garments, it is accepted that you need to gown from the head down.
When de-gowning, do so from the feet up. This means items are safely removed before particles above them are disturbed.
A visual guide to gowning should be on display at all times to remind cleanroom operatives of correct procedure.