Get him a new sissy wallet and purse to take out on special occasions and make him bring it with him to keep his phone, keys, wallet, sunglasses etc. You can also get him a nice feminine pink cover for his iPod (and matching pink earphones) for the gym, or a cute feminine sticker or cover for his phone.
This will be a wonderfully humiliating sign that he's being treated and trained as a sissy girl to anyone who sees him. He will feel embarrassed and ashamed, but will have no other choice.
Surprise him with a nice gift, and enjoy the look on the face when he see's it's so obviously feminine that he will be embarrassed. Remind him that since he's a sissy girl, that this seems more appropriate for him.
Whenever he's leaving the house and asking you to keep one of the many things (keys, sunglasses, wallet, phone, computer cover, etc) that he's carrying with him, just tell him to get his sissy purse. Make him bring the purse with you whenever you go shopping and you want to fuck with his mind a little. Make him carry other feminine things inside as well, like lipstick and his tampons. When you are going to the gym, secretly hide his regular earphones and replace them with hot pink ones and a pink cover for his iPod...then send him to the female workout classes.
Allow him to try to hide the feminine items, but make sure they are so evident that it's impossible to totally hide them.