Queen of Hearts
This is a costume that will probably require a lot of investment, whether you go with a storebought costume or putting your own Queen of Hearts ensemble together, and a wig is pretty indispensable. But when you see this tutorial from Kandee Johnson, you'll think it's worth it. The big trick here that would be valuable for some of these other looks as well is how to conceal your eyebrows with Elmer's glue. Sounds crazy but it's water based and easy to remove.
Some of her other videos include Betty Boop and the rest of the Alice in Wonderland characters.