In a SHTF situation a "tactical" looking vest may be an attention grabber, and not in a good way. Personally I'd be wary of someone approaching me while I'm trying to keep my family safe while civilization falls apart, wearing tactical clothing. I will probably see you as an immediate threat and react. The other side of the coin is you may be advertising your level "preparedness" and draw attention from people who are less prepared and then you would have to be in a position of defending your supplies.
I would like to be as nondescript as possible. Plain backpacks, cloths, weapons concealed as much as possible.