The bounty hunter disguise that Leia has in Episode 6 is not the only outfit that the Stalker armor shares characteristics with. Looking more closely, one can see similarities to Jango/Boba Fett's armor (the T-visor), General Grievous (claw-like hands and number of lightsabers kept as trophies), Darth Vader's armor (the overall concept, plus the freaky breathing sounds that he makes), and even Count Dooku (his lightsaber has several spiked emitter guards that resemble the single guard on the Count's weapon). Given TFU was supposed to mirror and remind one of the Star Wars movies, it shouldn't come as a surprise to see that the Sith Stalker armor's design was inspired by a number of other elements of the canon. The game contains many other references to other Star Wars material (movies and EU) as well.
"Grant Allen [...] had written a book about the Evolution of the Idea of God. [...] it would be much more interesting if God wrote a book about the evolution of the idea of Grant Allen." ~ G. K. Chesterton, The Everlasting Man