15.

 It is proper [opportet] that above all they abstain from every curiosity, as much in clothing as in whatever other things. And according to the wholesome counsel of Blessed Peter, the Prince of the Apostles, having put aside the other vain ornaments of this generation [saeculi], they ought not carry any corporal ornament, except their own religious habit (Rule op. cit., ch. VI).  They are bound also to observe the cloister according to the sacred canons and their own Constitutions.