Craft Thalmor Armour at any forge (under Leather).

(Male & Female)
Weight: L = Light H = Heavy
Thalmor ArmourL (13) H (15)
Thalmor Gloves L(5) H (8)
Thalmor Hood*  L (10) H (13)
Thalmor Boots   L (10) H (13)
*********************************************************************************
Requires: Advanced Armours, Arcane Blacksmith.
*********************************************************************************
Available in: Blue & Black (wearing any mix will still give the full set bonus)
*********************************************************************************
Codes:

Depending on what mods are loaded, the numbers below may differ. It could be 05xxxxxx 06xxxxxx etc.

Blue:
Armor:  060048B5
Hood:   06004E1C
Gloves: 06005381
Boots:   06005382

Black:
Armor:  060063B5
Boots:   06006925
Gloves: 06006926
Hood:   06006927

If these don't work, open console and type 'help thalmor' Use pageup/down to scroll through.
*********************************************************************************
Known Bugs:

None known at the moment.
*********************************************************************************
Note: Wearing this armour does not make you a member of the Thalmor (no disguise), It's just the armour!

*Circlet friendly