Phase 3 is the accessories. Beckett was sick Friday night and Saturday morning, so I was in a rush to finish everything in between him needing mommy cuddles to feel better. I didn't get as many step by step pictures, but really, they are just a bib and a baby hat. If you are trying to make a similar costume, there are a million different hat and bib tutorials out there by people better at writing tutorials than me.
I agonized the whole time over how to make a hat like Mr. Stay Puft's. I finally decided to make it easy on myself and do a simple baby hat inspired by the original. Honestly I think it looks a little wonky, so you may want to find a different way to do it. Here's how I did Beckett's, though.
I measured Beckett's head (18 inches) and divided the measurement by three (6 inches). Then I traced one of Finn's knit caps on a sheet of paper. I centered six inches on the bottom line and slimmed down Finn's hat pattern to make my pattern piece. That probably makes no sense to anyone but me. The pattern piece is on the right side of the photo, so maybe seeing it will help.
I cut a strip of navy fleece to make a band/cuff for the hat. Before sewing it to the hat, I used iron on letters to write "Stay Puft". Then I sewed it into a circle and attached it to the hat. I sewed red ribbon to the top and tacked it so it falls properly.
Tomorrow I'll take a picture of the whole outfit on my little marshmallow. For now, I'll leave you with this:
Phase 1, Phase 2.1, Phase 2.2, Phase 2.3