On one hand:
Wearing the rosary around the neck has the potential to start a conversation about the rosary.
On the other hand:
It could be interpreted as consent to the practice of wearing a rosary solely for fashion, especially in the context of others doing so.
Further, I personally find it reduces the quality of holiness (set apart) of the Rosary in its ready comparison to “bling”, and that the Crucifix would be roughly positioned over my belly button, and not my heart.
Finally, you, (your actions, words or lack thereof) and the rosary you wear are presented as one image to those who see you. They will be associated. Apart from God’s grace that association will be negative towards the Rosary.
Praying it in public would perhaps be a better method of getting questions, presenting proper use, and helping to stir the consciousness of those around you.
There is of course again the danger of perverting this in how it is prayed, but it is an opportunity to present a gentle and quiet spirit.
A scapular may be effective, if you are prepared to educate people on it as they ask about it, or challenge it. (I know I am not so knowledgeable). Particularly our ultimate desired end to which these are but aides. I have found it more often the case that those participating in above fashion statements lack the fundamental Evangelistic principles that would allow them to make sense of what or why we do this.
That said, Mary has introduced Christ to the world and to many for a long time now. I would advise just to be careful not to jump the gun.
Great intention, the challenge now as always for all of us is… How do to adorn ourselves with Christ?
1Peter 3:2-4
Romans 13:14