I have to say, the new trainer customization feature is one of my favorite new aspects of the game. It actually makes me want to go out and buy new clothes and stuff.
It's one of the best features to be honest. I literally spent like 20 minutes yesterday trying to determine how I wanted my character to look. Granted, I still think the customization feature is a bit limited particularly when it comes to hair color, but all the different accessories look great. Dressing up the female character is so much fun.