Two issues here.
Firstly, the hat isn't shown in less info profile view.
To reproduce navigate to the profile page of someone with a hat and click
Less Info (if it's not already in that view).
Secondly, if you go to the page and it defaults to the less info view and you then click more info the hat is in the top left not on my profile picture.
To reproduce navigate to the profile page of someone with a hat and ensure you are in
Less Info view mode. Navigate back to the profile page.
After opening any profile page (when default view is "less info"):
After clicking on "more info":
This can be reproduced in Winterbash 2013 too.