Stay Puft Marshmallow Man Baby Costume

My son joey is wearing the costume, he's the Stay-Puft Marshmallow man from Ghostbusters. Joey is a chubby little guy, so my husband and I were discussing cute "chubby baby" Halloween costumes, and my husband came up with the idea! My Aunt Terrie made the costume, so I don't know exactly how it was done, but I know it was pretty easy--she sewed 2 onesies together and stuffed the arms and legs with stuffing. She cut the bottom of the onesie off, and cut a slit up the back so that the back is completely open. She sewed ribbons on either side of the back to tie it on and make it easy to get on and off. She used white and blue felt to make the hat. The costume was a huge hit--and a joey loved wearing it!!