"In the real world, Halloween is when kids dress up in costumes and beg for candy. In Girl World, Halloween is the one day a year when a girl can dress up like a total s*** and no other girls can say anything else about it." Need we say more to convince you that a Mean Girls costume is the right choice for your next fancy dress event? Cady clearly knew the 411 and so do we! Whether you're dressing for a 'noughties' themed costume party, a Halloween party or you're planning an totally fetch Hen Do event, our collection of Mean Girls costumes will ensure you can have the most awesome time, drinking awesome shooters and listening to awesome music, and then just sit around and soaking up each other's awesomeness.