Board Thread:Morrowind/@comment-4952574-20130712074500/@comment-6881629-20130712082055

Some kind of Fortify Skill equipment for sneak might help i've tried looking for a potion recipe i'm sure there are some but all i keep getting are Skyrim results but if you can buy or make some potions can help too.

Heres the UESP page for sneak anyway it has some useful information (like a patch for the bug with pickpocket).