A Tunic Question

[Graff]

I have a question about the construction of tunics that maybe someone can shed some light on. I have noticed that most of the construction patterns used by re-enactors is to cut 2 pieces to the desired size and shape and sew them together. However , I was wondering if construction of a tunic cut in one piece would be a more accurate method or are both correct...I have been dwelling on this for a few days and have not really been able to find an answer searching online. I just wanted to see if anyone here had any thoughts on the matter.....

CHEERS
Mike