A complete set of simplified Dread Master style armor is something that I would like on several characters. And what do I mean with simplified, the Dread Guard Assassin npc that can be found in Section X in 1.5 is a great example of this. Similar to the battlemaster gear for the sorcerer (and the original dread master gear) but simpler shoulders, gloves, and head slot but still very much in the same style.
The helm that the Red Blade wears as customizable armor.
http://starwars.wikia.com/wiki/Red_Blade
I just can’t stand seeing Lieutenant Pierce in Bounty Hunter gear and even if there was an adaptable version of an Imperial uniform he does not seem like the type that would run around a lot in a uniform. The grey, red, and some white version of the imperial trooper armor that he starts with looks great, I would love to see that as customizable armor even if it was restricted to this companion.
http://www.torhead.com/item/aiWC4mg/pierces-jacket
Customizable versions of the tionese/columi/rakata/battlemaster/war hero belt and bracers. So that you can get a complete look even if you are using these outside of their intended usage. Like if you are using the battlemaster gear with switched out mods in pve, you still can’t get the right belt and bracers if you want to avoid the expertise ( and the low stats ). And this really goes for all the complete armor sets that are sold on the cartel market, they should include belt and bracers.
I cannot find it now but I think at one point Make gets a headset that really looks like a headset complete with microphone that goes to her mouth, would love to have that as customizable armor.