If Jehovahs Witneses manning a cart is all they need to do to be "a witness to Jehovah" these days then surely the "dog collar" worn by vicars means vicars have been "witnessing" since 1884.
In fact any religious garment could do that job so if JWs just wore a baseball cap with the JW logo on it when out that could be classed as "witnessing". Look at the hours they would clock up. They could be witnessing full time then if wearing the identifying cap while at work if such caps were allowed, out shopping or in fact anywhere there were people. A JW sticker would be witnessing.
When going d2d some days there were no people anywhere but then we were "witnessing to the angels" just by being out.
By the ever decreasing standard of effort required to be considered "witnessing to jehovah" wearing a logo will soon be enough no matter what activity you are doing.
What a merchandising opportunity for the GB to replace dwindling donations. Forget magic underwear. Sports gear, baby strollers, jumpers, coats etc etc. All with the JW logo attached. The list of items it could be displayed on is endless no longer limited to just buildings.
Stripes or stars could be added to clothing to denote ms/elder/pioneer status etc.
Oops I forgot. There is no hierarchy in that religion. :p