It seems that most of her costumes are Eman Zaki's. Eman has a website
index. She has some sketches as well as a bunch of pictures of Leila (and others) in her designs. I Think if you wanted a replica of one of Leila's cossies you could just send her a pic. I've never ordered directly from Eman, so I don't know how it works. I'm sure other Bhuzzerds will chime in.