Mine are 9 and 5, they pretty much wear want they want.

Sometimes I have to edit it so its weather appropriate or I help them with things like "those colours don't really go, how about this one?" and stuff like that. So they are still choosing but with a little help or sometimes I'll pick a few things out which go together and get them to pick from that.

They also have a draw of clothes that are for around the house and playing outside and they know that stuff isn't for going out in which helps.

But other days I don't care and I'm sure they get plenty of head shakes.