You can try this site:
http://www.thegoosesmother.com/index.html
An Extremely nice woman named Nancy Townsend makes diaper harnesses for ducks and geese. I bought her baby harnesses and adult harnesses for my ducks (for when they come inside due to extreme temps, illness, injury). It's a lycra suit that doesn't get in the way of wings and doesn't fall off. I'm positive she could make one to fit a chicken just fine. She even gives out her personal number if you want to ask questions over the phone rather than email...
http://www.thegoosesmother.com/index.html
An Extremely nice woman named Nancy Townsend makes diaper harnesses for ducks and geese. I bought her baby harnesses and adult harnesses for my ducks (for when they come inside due to extreme temps, illness, injury). It's a lycra suit that doesn't get in the way of wings and doesn't fall off. I'm positive she could make one to fit a chicken just fine. She even gives out her personal number if you want to ask questions over the phone rather than email...