3d character cloth workflow question

bmarko01

So I have a question.  Its more like "how do I approach this?" kinda thing.  Im working on a personal project where Im making an alien that would put into unreal engine and stuff.  The character has four arms and some robes on him.  I wanna have it where his two small arms are hidden within his robes and he has guns underneath and stuff.  Im wondering how should i continue with the robes?  Do i sculpt them in Zbrush? what position should they be in?  I want to know more about cloth prep and the tutorials I have seen so far have been subpar.  If there is a video that would help me out just point me in that direction.  

Thank you,  
Brian Markowitz