I bought a kid sister doll on ebay, then a striped dress from a thrift store. i cut the dress up and made one for the doll. I duck taped the doll to my side and had the same hair style, shoes, glasses as her.
It was a hit with everyone
Related costumes:
A Bittersweet Halloween 
Family Movie Night Snacks Costumes 
55+ Coolest Homemade Fairy Costumes 
Anime/Harajuku Street Style Couples Costume 
Striped Birthday Candle Costume with Lighted Flame 
Coolest Light-Up Robot Costume 
Couples Optical Illusion Ventriloquist Dummy Costume 
Awesome UFO Alien Costume that Lights Up!
Very cute & clever!
And an Interesting play on words :-)
…next year or one to come. I still have my old Cabbage Patch doll, so I’m halfway there :-)