It can be hard to tell what is official Barbie merchandise and what isn’t. I’ve found that the larger chain retailers always seem to carry Barbie party supplies that Matel officially licenses. Small retailers can have several options too, but it isn’t as common. Some will specifically say that they use formally licensed materials. The product wording gives it away; look to see if they use the word Barbie in the listing title. If they only use related words (such as doll theme, Malibu, dreamhouse), then you can assume it is not official. That roundabout language is their way of avoiding copyright infringement issues. Choose wisely.