I simply cut up an old pair of Topshop jeans, and turned them up! I even just ironed the turn ups with my GHDs!
If you are going to make some also, my biggest tip would be to gradually cut off the legs. If you cut too short in the first place there's no going back! Remember; you can always take more off, but you can’t add more on! Same rule that applies with sugar in tea! ;)