I love this t-shirt. While it's Doctor Who merch, it's not totally obvious, and the Weeping Angels are one of my favourite villains from Nu-Who. As for sizing, I looked at the measurements from the other ‘Ikon Collectables’ tees, and decided that the medium was the safest option. I normally wear a size 10, and the medium is a great fit. I'd say this size is best if you normally wear a size 10–12. The fabric is good, too. I think this t-shirt will last me a good few years.
In short, I highly recommend this shirt for fans of Doctor Who. :)