Just a brief bit of inspiration for you today. Somehow all of my step-by-step photos got deleted. But, it's pretty easy so you can figure it out.
I took a picture of our cat, turned it black and white, and then printed it on iron-on paper. I ironed it onto a plain white onesie. Then I cut out glasses from red jersey fabric and stitched them on.
The onesie is already stained. Oh the joys of a baby.