I recommend slightly smaller t-shirts; your arms are getting lost in the one pictured in >>9. A printed t is a fine thing, but if it's too big you'll look either dorky or wannabe gangster rather than rocker. You might consider a short-sleeved collared/buttoned shirt, too, perhaps in a western or work-shirt cut. Again, trim cut is key.

Necklaces are usually tacky on men; not recommended. A bandana is a fine idea, but I'd go with black rather than blue or red; no gang associations that I'm aware of.