One of my favourite programs at the moment is Game of Thrones. It's based on a series of novels called "A Song of Ice and Fire" by George RR Martin. Set in the the mythical Seven Kingdoms of the Westeros, it chronicles the violent struggles of the kingdom's noble families to gain control over the Iron Throne. Its brutal, complex and fascinating. You can read and see more about it here.
What I think is fascinating from a costume point of view, is that although the series has a medieval flavour to it, it also has a key fantasy element which allows the clothing to be less about period costume and more about the story and the characters. It's a blend of styles from many countries and period making it a fantastic looking series.
Costume Designer: Michele Clapton
Here's a fabulous video with Michele discussing the costume design detail for the series including the though process behind the colours, textiles and styles selected for the characters.
I really enjoyed it, I hope you do to.