A good mother-daughter costume can be matching, like two skeletons or two witches. Or it can be two different characters from the same show or film, like Sleeping Beauty and Maleficent or Morticia and Wednesday Addams. It can also be two complementary things, like a baker and a cupcake! It always pays off to think outside of the box for a Halloween costume. And there is something about pairing up for a costume that makes things even more fun and interesting. And then, of course, there are all of the amazing photo opportunities that come with dressing up as a family or in a pair. Mother-daughter duos can find costumes that are cutesy, scary, funny, over-the-top, or whatever works for them. It is all about having fun and making memories. Here are 20 mother-daughter costume ideas that moms will totally want to try this Halloween! And we guarantee that little girls will love these too!