When I travel, I'm usually wearing khakis, a button-down shirt, and a blazer. I wear my FT pin on the blazer -- which I hang up myself in the F cabin (I've given up waiting for the FAs to do it).
I don't wear the blazer when my upgrade hasn't cleared in advance. It gets smushed in the overhead.
If I'm wearing a suit, I wear the pin on my suit jacket as well.
I have FT luggage tags both on my bags I'm checking (a rare occurance) and the bags that I carry on -- including my laptop case.
So, I'm hard to miss -- or so I'd think.
I've never been spotted yet.
I did spot a woman with a FT pin on an early morning LGA-IAD flight about a month ago. I was in 2B and she was walking back to Y -- I saw her as she walked past, and there was no chance to say hi.