I made a really quick and easy Katy Perry dress for Dragon Con 2014. It took me maybe a day and was meant to be a fun and comfy costume for nighttime shenanigans. :)
I used a Simplicity vintage bathing suit pattern (1374) and modified it into a dress. Its just lycra swim fabric. I don’t have professional images of it and didn’t take much in the way of progress, but here is what I do have!