Is he only afraid of it when you try to put it on him, or all the time?
I suggest getting it near him, putting it near the outside of his cage, playing with it while he's nearby, then eventually letting him play with it. Praise him and make it a game. When Ollie would pick it up to chew on it, I knew it was time to start getting it on her. I started by just putting it over her head, taking it right off, and giving her a treat. Eventually she got to be fine with that. The next step was getting the whole thing on her, very quickly, and without losing any fingers (MUCH HARDER THAN IT WOULD SEEM!

). When I got it on her, I immediately gave her a treat, then took her outside to keep her mind off of it. She still picked at it then, and she still does. I haven't had it on her in a long time...its just not worth the hassle! If I take her outside, she is just in her travel cage. I need to start working with it again now that its getting warmer out...