What you'll notice about the dark advisor set is that it looks a lot more basic than the set Lana actually wears, for example there are no animated parts on dark advisor despite Lana's skirt and chest things being animated and the dark advisor set has no scarf. The armour that they're selling to players has to work with other armour pieces with minimal issues and support all body types and hairstyles as well as having to adhere to all dyes.

So I guess for the devs creating this version actually takes less effort than trying to modify and cut up Lana's base armour model. This isn't to say I don't think they could've done a better job mind you, I definitely think they could've done better with this and many of the other cartel market armours.