I did a homemade rooster collar and it didn't work for me... the rooster would be quiet for a day or two but then he would get louder and louder and eventually get the collar off.
How do you size the kids sock? Where do you buy a Velcro collar? I just came across this and if I can easily make my own I'd rather go that route, its cheaper and no worries on getting the wrong size and shipping back etc.