'N' and 'F'...

The difference between 'N' and 'F' is very much when it comes to English words.My friend called the company a few days ago and was told to wear 'f'ormal to work.But the new friend we made says that the person told her to wear 'n'ormal.That is the main difference.But nevertheless,what we wear is not important to them.Just no 3/4 pants good enough already.