You can wield a Taken sword and wear Taken armour in Destiny. Here's how to do that.
Destiny: how to get the Taken armour and Dreadfang sword
With the release of Destiny's April update, Bungie added the ability for you to get a new Taken sword called Dreadfang, as well as the Taken armour.
In the video, Alex shows you where to start the Pretender to the Throne questline, and how to finish it. You get the sword at the end of that quest.