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...
Just get one! ordered this http://www.mypetchicken.com/Diapers_Saddles-Chicken_Diapers_NEW_-P494.aspx tonight was the first night we tried it. Worked perfectly. Easy to put on, easy to clean, and did not seem to hamper his movement, though he kept pecking at it tonight and did not walk very much. He is probably just not use to it yet. He was in the house for 4 hours and when I took it off and put him in the coop, Only 2 poops! I am going to guess he was holding it (and since he was not moving much, that of course helps) but since these are not disposable, you only need one, just check it and change out the paper towel. I would say check/change it in when you get up, check it at noon, and check/change it at 6pm, Just change the paper towel and it should be fine.
Just get one! ordered this http://www.mypetchicken.com/Diapers_Saddles-Chicken_Diapers_NEW_-P494.aspx tonight was the first night we tried it. Worked perfectly. Easy to put on, easy to clean, and did not seem to hamper his movement, though he kept pecking at it tonight and did not walk very much. He is probably just not use to it yet. He was in the house for 4 hours and when I took it off and put him in the coop, Only 2 poops! I am going to guess he was holding it (and since he was not moving much, that of course helps) but since these are not disposable, you only need one, just check it and change out the paper towel. I would say check/change it in when you get up, check it at noon, and check/change it at 6pm, Just change the paper towel and it should be fine.