I spotted a Barbie inside of a case at one of the local thrift shops. The Barbie was not vintage, but the dress she was wearing was!
I happily brought her home, because I would have paid more than the asking price for just the dress alone.
Here's my vintage Barbie modeling it for you:
And here's Midge wearing the blue "Let's Dance" dress:
And now, the two together; aren't they a pretty pair?