First, Jenelle wrapped the pillowcase around herself, to look like a dress. It was way too big, so we cut a huge chunk out of the back.
We secured the dress with duct tape. You can use tape that is the same color as the dress, or you can use black to match the accents and windows.
Next, we made double-sided duct tape straps. You could go strapless, but she's 11 and that's not happening. :)
The “windows” are 1/4 of a piece of printer paper, with lines drawn on with a black marker, and duct tape around the border.
Word didn't get our letters very big, but we put it on size 72 and added a black background. Used tape to secure it to the dress. If you can, I'd make the size 96 or even 100+. Want to get even more technical? Use this Tardis Printable Door Sign!
This is what it looks like while laying flat. You could sew the back to make it fitted, but this way it's easy to fit more than one person if necessary.:)