That's really your call. How do you feel about it and how do you think you would feel if you were the therapist?

Me, I wouldn't want to show what you describe anywhere in public. I'd add a scarf. I dislike wearing low necklines, even though I'm not uncomfortable on a nude beach, go figure! It's a personal choice. I'm sure therapists, as health professionals can look past much more egregious clothing choices. (So many people dress like hookers nowadays, it seems.)