My 4 year old son LOVES germs and bacteria. He told me he wanted to be a white Blood Cell (a leukocyte) and he wanted his little brother to be the germ so he could “protect the world from germs-or his little brother”.
The Homemade Leukocyte and the Germ Costume is made from half of a queen sized mattress pad tied at the waist with a ribbon drawstring to “puff it out”. The pieces on the WBC are white fuzzy yarn wrapped around the stretchy clear necklace product for making your own jewelry. I simply folded the plastic pieces in half, wrapped the plastic with the yarn and sewed them on.
I finished it off with a white turtleneck shirt, shorts and black and white high top shoes!
My germ is a machine sewn fleece jumpsuit with colored fuzzy yard knotted and sewn on the outfit. It Velcros at the shoulder for easy on/off. I dressed him in a matching orange or green shirt underneath.
Finally, I identified each molecule with a label printed on fabric that was run through our printer.
Related costumes:
Disinfectant Wipe, Germ and Biohazard Waste Group Costume 
Coolest Germ Costume 
Coolest Plastic Surgery Junkie Costume 
Coolest Homemade Mad Scientist and His Creations Costume 
Original Homemade Prescription Bottle Costume 
Coolest Homemade Swine Flu Group Costume 
Coolest Homemade Swine Flu Costume 
Original Wordplay Costume Idea: iCloud!
What a funny story. Would love to see the germ costume.