Bless, Father Anthony!
Thank you!
When I teach my religion classes, I do wear a (large, three-bar) cross over my sweater or, if I'm wearing a jacket, I wear a cross lapel pin.
I just want to do this for witness value (I also wear a prayer rope on my wrist, but have a blessing from a priest to wear one).
I only do this in that context and in no other. The nice thing that has developed is that now many students are wearing crosses over their clothing as well. I think that is a positive thing.
Having the large cross under one's clothing serves as a reminder to me of our Lord's Suffering and also reminds me to invoke His Divine Name incessantly.
The chain can indeed be uncomfortable, but I am nothing more than God's sinful and unworthy "rab" or slave!
Kissing your right hand, I again implore your blessing,
Alex