For Robes, any Defense bonus counts toward the cap of 10 2.

Robes: Ossus Keeper Robe (+4 WIS, +1 Defense 2).

Hands: Improved Automation Gloves (+5 DEX).

The Target Assessor is a nice alternative for characters without Battle Precognition or for those who want to sacrifice a bit of Defense for a bit of Attack (+2 DEX, +2 Attack).

Implant: Quickness D-Package (+4 DEX, +1 Defense 2).

Note that Finesse for Melee Weapons implies Finesse for Lightsabers as well, though you can gain Finesse: Lightsabers from an in-game conversation midway through the game.

Does not affect Defense, but an obvious choice for a character like this.

Power Attack: No Defense penalties (and decent Damage output, too).

Male: To gain the Battle Precognition Power from the Handmaiden, which adds your Wisdom Modifier to Defense.

All of the Prestige Classes have the same Defense bonuses.

Jedi Guardian has the same Defense bonus, but Sentinel also give the immunities to Fear, Stun, and Paralysis, which fit better with a defensive character.

To gain all bonuses from companion conversations, you will have to make some Dark Side choices.

Stat increases from companion conversation can provide +6 to Wisdom.

Why 15? Over the course of the game, conversations with your companions can yield three 3 +1 bonuses to Constitution.

Why put any points into CON if we don't care about Hit Points? Implants in KotOR2 now depend on Constitution.

Then increase every fourth level, yielding 7 increases at Level 30.

At Level 30, I can reach a value of 71 in Defense.

Kotor 2 best robes