Is this a Barbie outfit?

[niwib_64]

I've looked all over the internet but haven't found this outfit anywhere. It doesn't have a Barbie tag on it, but it does have a rainbow belt that I've seen on another outfit. Hope someone can help!

[orphie1402]

https://www.worthpoint.com/worthopedia/vintage-barbie-fashion-collectibles-1889506424

[niwib_64]

Thank you!