Please stop making your costumes so poorly.
Yes, yes, I know, they are "costumes" and only really supposed to stay together for one or two wearings, three at the most. However, I also know they are designed for children, and you should know that when a child likes something they usually REALLY like it.
Take, for example, my daughter Meg. It was just over two weeks that her grandmother bought her a Princess Tiana costume at Costco. Since that time it has rarely left her body. She has eaten in. She has slept in it. She has played in it. She has twirled in it. Oh, you would not believe the twirling. I have to give it to you that you make dresses that twirl well. They just slowly unravel during said twirls.
It's not like this garment has been treated poorly. I mean, other than the regular toddler wear and tear. Both my Mom and I have carefully hand washed it, treating the fabric (which is apparently made from tissue paper's weaker cousin) like it was spun gold. Despite that the fabric seems hell bent on disintegrating. And in the areas where the fabric is holding fast? The seams are giving up the ghost. Did Cinderella teach you nothing about tying off a knot at the end of stitches?
I won't even go into the fact that no self respecting princess would wear a broach with her own picture on it -- after all, this letter is about quality issues, not common sense. I will just say this: do you really think any little girl wouldn't know which princess dress she was wearing? Do you doubt the effectiveness of your brainwashing that much?
I don't even care if you charge more for the costume. Maybe you could make two different versions, the cheap one time junky costume, and the "you can wear this like clothes" version. I'm sure there are some weird adults who would appreciate it too.
Really, think of the children. Or at least, think of my child. My strange, princess dressed child.
P.S. I am really not thrilled about your treatment of Moms in movies. The ones who are dead actually come out the best. That's another letter though...