We have this discussion many times before but I will still want to express my opinion here.

Wear what ever you are comfortable with. I like boxer briefs myself. I don't go regitmental all the time, specially when I am with my son and in a family setting. I really careless what other people think, I just do what my comfort level is. You should do the same.

Freedom goes both ways. We should be free to do what we want to do, even to wear something under our kilts. We shouldn't make a big deal even if a fellow xmarkers to do it non-regitmental.