When middle child told me that he wanted to be a yellow butterfly for Halloween, both my brother and I were surprised. Middle child is known as the destructor, the child that will break anything given to him. I sort of thought he'd go for something like Spider-man given that is his latest obsession. Did I mention he's three?
However, middle child kept to the yellow butterfly costume idea for a good month so, that's what I'm making him. Oldest child wants to be Link from Zelda - asking his medieval minded Aunt to make him a t-tunic and hat? Sure! Yeah, it took all of a few minutes for that one.
Anyway, back to the middle child's yellow butterfly. I had no idea how to make a butterfly outfit so I did some research:
Most yellow butterflies I saw looked like this. They were yellow but had thick black lines. I realized that a simple half circle cape with some cutouts might work.