I am personally very fond of the sidecut, so it would be really cool to see it be added to the wardrobe.
In addition, you could add plenty other "cut" styles for both long, medium and short hair ^^

I also found the clothing options to be rather minimal. I'd love to see more tights (with cute patterns?), different types of jeans (like skinny jeans), skirts etc. More fancy shirts, suit jackets, dresses too perhaps?
One thing I do need to stress is how small the amount of shoe options is. Need me some sneakers :3

I don't know if this is the kind of suggestion one is to post here, but here it is! :)