http://glosswardrobe.blogspot.co.uk/search/label/Black%20Milk. I'm about four inches shorter, a dozen years older and a good stone heavier, but I still really wanted those leggings.
I bought a pair of the Galaxy Black Leggings in medium - I'm a size 10 to 12 (I fit 10s, I feel more comfy in 12s) and they fit well. Shipping from Australia was fast even with standard shipping - I got them a week after I got the shipping notice. These are not inexpensive - it works out to about £50 with the current exchange rate (before shipping), but they are very high quality and are made in Australia. I love them and want more pairs - other Galaxies, The Great Wave and Starry Night are now on my birthday list.
The top is from Uniqlo, and the necklace is from Crazy Pig. The Black Milk website is at www.blackmilkclothing.com.