need help with dress for 2nd bday party

Ok so we are not doing a big party but want to make it Minnie Mouse and special. I have been looking for dresses and I keep coming across the same style dresses (pillow case dresses). As I look on Etsy I am liking ones like this


Then I realized I have a dress very similar to this sitting in her closet never worn.
So I am going to use the dress I have but I thought maybe I would buy an iron on for it.
I can do somehting like this: only with an I


or: (hoping I can get pink
or:


Any suggestions or opinions/