Cracked has a neat article on shows [GoT among them] that have insane details.
http://www.cracked.com/article_21544...y-noticed.html
It's long with a lot of pictures, so go to the site.
Basically, although it looks like Khaleesi's outfit hasn't changed, it has gained [dragon] scales on the tunic from episode to episode, and Sansa's wedding gown is an incredibly detailed tapestry of her story from Tulley to Stark to Lannister.