Without panties:
f) Don’t wear panties or a string under your skirt on a whole servant day. If you do this and you get more than one compliments you mustn’t buy a new skirt or shoes. If you do this and get only one or no compliment, you can wear a skirt that is two inch longer than your last skirt or shoes with one inch lower heels.
You can use this rule only if your skirt is so short, that it ceases three inch (or more) in standing position over your knees.