I wanted to make my costume from scratch, and I wanted it to be cheap but reusable. The link to this Buggy and Buddy butterfly wing tutorial popped up on Facebook a couple of weeks ago, and I knew I had found my costume. I didn't change the measurements at all from the kid size; I just extended the elastic. To decorate the felt background, I cut out pink, light purple, and white two at a time and appliqued them with my sewing machine (I skipped the glue step and used pins). The costume cost about $7, including the black elastic on sale! Plus, it only took a couple of hours to put together!
I fixed my hair in pigtails to mimic antennae since I didn't find it financially smart to buy a cheap pair from Target for another $3. I'm really happy with this costume because it's well-made, it will last for a long time for dress up (for my future kids), it's easy and fast to put on, and it garnered the awe of a couple hundred preschoolers. ;)
I posted a very quick scope on Periscope of me running around in my costume/explaining it (you can see it here on Katch). You can also read about my cupcake costume from last year (fabric scraps were essential!).