Here is a great cosplay from Elsa look-alike Anna Faith Carlson. She nails the light blue dress down to the makeup and the hair (which is not a wig).
This is one of the most popular costumes for adults and kids for Halloween. The best dress is this one here. I like this one for a kids Halloween costume. Here is the wig.
You never see a good Alice. I think she is a great character, but maybe some think her costume is too conservative so it isnt as popular as some of the sexier cosplays. This is a great portrayal by Hopie Chan.
To pull this off you’ll need the blue dress with white apron and of course the blonde wig with dark headband. You can vary the length of the skirt and the look of the stockings to fit your taste.
Here is a nice take on an 80s favorite: Gizmo from The Gremlins. Very unique! This is a custom costume worn by the beautiful Amiclubwear model Leanna Vamp.
You can piece this together if you shop around. It is hard to find some of this in stock. For something close try here, here or for those leggings try here.