This is as picture perfect as you can get with form.As you can see,his arm is straight.His forearm is turned out,maybe this is what your shop guy was trying to relay to you.I have never heard a coach tell someone to turn their elbow out.That is wrong.Your forearm is what should be turned.If this is done correctly,you shouldn't have much trouble with your stringhitting your hunting clothes.
The big thing here is the above is for a target archer,IF you have trouble with clearance,you may want to shorten your draw a little and create a LITTLE bend in the elbow.This has become the "correct" way of setting up for hunting but turning the ELBOW out is not what you should be trying to accomplish.It is the forearm that should be turned and it shouldn't be turned all the way out.
Michael Braden,pictured above is a level 3 coach and a 7 time national champ.he knows a thing or 2 about form.