Reddit reviews Naruto Anime Profiles, Vol. 1: Episodes 1-37

I think this topic is a bit more ambiguous. While it is true that Hagoromo says "give me your dominant hand", it seems that the symmetry of the panel would of been off if he had raised his right hand.

Here's a couple bits of information that we know so far:

• When Hagoromo tells him to present his dominant hand, he presents his left.
  
  
• He uses Chidori with his left hand
  
  
• He writes with his right hand
  
  
• His weapon holster is on his right leg
  
  
• He uses his sword with his right hand
  
  
• There is supposedly an excerpt from the "Naruto Character Profile Guide Episodes 1-37" which states that Sasuke wears his Shuriken Holster on his right leg because he is right handed.
  
  I cannot verify the last point because I can't seem to find a scan of the booklet, but it is purchasable on amazon here.