Means NOTHING. I once did business with someone who tried to deceive me who wears sacramentals. This person is still engaged in professional fraud.
This. Our Lord said to pray in our closets. I.e don't practice your Faith merely to show others that you are pius etc.
"Wow look at him, he's doing that/wearing xyz, he must be very religious"
This should not be the intention. Though it can't be helped for people like monks who wear their habit all the time. Since their intention isn't to be seen but they simply practicing their faith and keeping their rule.