I used an elastic pre smocked or shirred cloth.
It is sold with the top already shirred like this to make dresses and tube tops. If this is not available, there is an option that I haven't tried which is to use elastic thread in the bobbin and make your own shirred cloth.
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All we have to do is stitch the sides. To make straps use a piece from the bottom of the dress.
Attach the straps to the front of the dress so it can be tied to the back of the neck. Or straps can be stitched to the front and back so it could be tied above the shoulders. Hem the bottom to desired length.