French maid costumes can be bought at retail stores specialized clothing stores for butlers and maids. Online one can look at eBay as well. Beware though there is a fine line between a functional maid costume and a halloween or adult costume.
Any costume store usually carries the French maid costume. Around Halloween, they can be found at departments stores in the seasonal department. The catalog company, Oriental Trading Company, has maid costumes available all year.
You could buy costumes at a costumes shop there are many all over the world so get in your car and drive around find one then look inside to se if they have what you are looking for.
There is one in Beauty and the Beast
You can buy costumes that look like him on the Internet. You can use a search engine to find a specific outfit. These types of costumes can be expensive.
Cleopatra costumes can be purchased from Party City, Buy Costumes and Party World. Online Costumes4Less, CostumeCraze and CostumeDiscounters have Cleopatra costumes in stock.
One can buy 80s Halloween costumes at various online retailers such as Amazon, eBay, and Etsy. Additionally, costume shops and specialty stores that focus on vintage or retro clothing may carry 80s-style costumes.
One can buy costumes in the style of the Swedish band Abba from many places. A few online places include eBay and Amazon. One might also try one's local costume shop.
"The french maid" if it's a noun "The one" if it's an adjective
Halloween shop or tesco
Disney costumes are very popular, you may know someone who has one lying around that would fit your niece and not have to spend a dime on a one time use item. If you wish to buy it try http://www.buydisneycostumes.com/
Party City has always been a great place to get everything you need in one stop. They have 1000's of costumes and decorations. They specialize in Halloween
There are one of Zuko and Aang from the movie(not animation).