superhero mask, shirt, i am also trying to find one
green lantern, from justice league The Crimson Chin
Costume Castle
Elvis is a good costume
There are literally dozens of different halloween costumes available for your son. One of the best costumes is actually the costume of a cowboy.
"Costume Express" is a good place to find the costumes you want. If "Costume Express" does not have your wanted costumes, I suggest making your own and there are a lot of accessories out there that match your nephew's needs.
Cute dog costumes do exist in the world, and they come in a variety of styles. You can find a dog costume a your local costume store, as they have started to carry dog costumes.
There are many good ideas for costumes depending on the likes of the individual. Costume ideas include, dragons, witches, and princesses.
You can find a good hippie costume at costume express. They carry a bunch of different costumes and they are just a costume store so they would be the best place to look for your hippie costume.
There are genie costume that people can get for Halloween. Individuals can locate genie costumes at www.wondercostumes.com/genie-costume-qsgenie.html.
At your home make costumes that you like from tv or books if you don't know how find someone that is really good at making the costumes. Good ideas for costumes are naruto character costumes or any other costume you like.
If you are looking information on what would be a good alien costume for Halloween, the best site is on costumezone.com/, they will give you the best costumes.
A good sailor costume would involve the traditional white sailor uniform with the white hat. These costumes can be found at the website Halloweenspirit.com.
A good place to start would be online, sites like Amazon and eBay have many different fancy dress costumes to buy at a good price. Escapdade is another good online retailer which does stock Super Mario costumes. You could also check your local high street for a fancy dress shop.