• Every year presents a challenge to choose a Halloween costume that is unique from everyone else's and makes a sexy impression. While many individuals choose to go as nurses, French maids, mermaids, witches and angels, think out of the box for a more interesting costume, such as a fictional character or famous performer.
  
  

Mary Katherine Gallagher

• A Mary Katherine Gallagher costume is a unique and sexy costume that will bring laughter and cheers from fellow partygoers. The one-piece Catholic schoolgirl uniform comes with glasses, an embroidered patch and headband. This fictional character was portrayed by Molly Shannon for Saturday Night Live and made into a movie in 1999. The character is prone to mood swings, hyper-competitive, and interested in becoming a superstar performer. The costume costs $30 as of 2010.
  
  

Lady Gaga

• Lady Gaga might be one of the more unique and sexy personalities on the planet in 2010, and dressing up as her for Halloween will definitely make an impression. Dresses are available that come with blond wigs and masks. Individuals can choose to wear long evening gowns or shorter party dresses as part of the costumes and if you really want to get into character, change dresses throughout the evening. The cost of Lady Gaga costumes ranges from $30-$40.
  
  

Avatar Neytiri

• The Neytiri costume is from the movie Avatar and is a full-body costume that replicates the lead female character. The character is from the Na'vi tribe, and Neytiri is the princess of the tribe. The sexy costume comes with stripe detailing, an apron and the necessary face paint. A wig is available that is sold separately. As of 2010, the costume is $35, while the wig sells for $17.
  
  

Spartan Cheerleader

• The Spartan Cheerleader costume is derived from a Saturday Night Live recurring skit and comes with an imprinted Spartan logo and pleated skirt. Cheri Oteri and Will Ferrell made the characters famous. The skit was about two awkward, self-conscious outcasts that embodied their school's spirit. As of 2010, this unique costume is $30, and for those who want to bring a date, the Spartan male cheerleader costume is also available.