The best costumes for kids are ones that don't block their vision, ones that are age appropriate, ones that fit well and most importantly something that they like. For younger children Disney characters are always a good choice as well characters from movies geared toward kids. For older children, movie characters are often good choices as well as costumes that depict occupations.
if you want to scare the kids
For Halloween I always prefer something scarier :)
A great Halloween craft may be carving pumpkins for kids. Another Halloween craft for children would be creating their own costume.
It'm amazing how simple a good costume can be to make! Look at http://familyfun.go.com/halloween/halloween-kids-costumes/ for some good ideas. Happy Halloween
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I believe the best place to get a halloween costume is from Party City.
WalMart is a store that sells many items online. You can purchase a kids Halloween costume from WalMart and they will have it delivered to the store for free or to your home for a nominal cost.
probly on wwe.com during halloween time or at halloween store.
Costume Castle
If you would like to do your halloween shopping online, I would strongly suggest going to Ebay or Amazon. Also, most costume or party stores have online stores as well.
I think that a doll costume would be cute, but so would a Princess costume. Halloween is for you kids and I think you should let them decide what to be. She will remember it always and you will be happy for the memories.
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.