Again, why not just go about your daily business as you do now, albeit with your jacket off? Make OC normal, dress as you currently do, but with the freedom of taking off an extra unneeded article of clothing. Be confident in your demeanor, be courteous, be polite, be professional. Smile at people as you pass by, hold the door open at the store.... surely a happy, polite, well dressed person will discourage a MWAG call far more than any inanimate object possibly could.
I know, because I practice exactly what I have written. 2 1/2 years and no MWAG calls for me.
And if you get a MWAG call, so what? Oblige by the law (silly OK OC law) and show your permit. Smile, be courteous to the officer, do not surrender any additional rights and help educate the officer and the department. Encourage the LEO to come here to OCDO and learn from states like WA and VA where the practice is more common and without great consternation on the half of law enforcement.
Embrace the change, be prepared for it and educate the public. And then work on the next phase of OC in OK, permit-less carry.