my little brother has been bugging me if there is a mod of her armor?

Try the Elder Scrolls Nexus... I'll be right back to put up the link for the mod... if there is one.

--EDIT--

Unless you want the Kasumi from DOA- which is a character save- there's nothing on the TES Nexus for either "Kasumi" or "Kasumi Goto"

Perhaps you meant http://www.tesnexus.com/downloads/file.php?id=31494?

http://www.thetechherald.com/media/images/201012/Kasumi_1.jpg

that is what he ment.