Personally I understand the wearing of the Sgian in the Hose expresses a show of good will and intention. Traditionally this implies you are among friends and do not carry the Sgian concealed as was the tradition amongst enemies.

Therefore I would see it insulting not wearing a black knife in a visible fashion as this would imply you have it concealed and do not trust those in the Church (I don't trust that choir boy he looks up to no good lol).