So if an employee wants to wear a kilt, or Fijian sulu will they be sacked? It's a dress when all is said and done
No, they are not going to fire you for what you wear, but being a major 'fashion' retailer they could fire you for not knowing the difference between a skirt and a dress. A dress is one piece from the shoulders, or there abouts, while a skirt goes from the waist down.
There is almost always a way to get rid of people you don't want working for you.