It looks like she has a few images in her gallery with that outfit.  Try going to her homepage, scrolling down to the bottom and send her either a Private Message or an Email.

http://excalibur.renderosity.com/homepage.php?Who=Z-Alaska

There is a member here called "Shukky" but there is nothing in their homepage, store or free stuff area at all.

It's possible that the outfit is a collaboration between the 2 of them and not available.

"It is good to see ourselves as others see us. Try as we may, we are never
able to know ourselves fully as we are, especially the evil side of us.
This we can do only if we are not angry with our critics but will take in good
heart whatever they might have to say." - Ghandi