124 Ordinaries, by the encouragement and favor they show to art which is truly sacred, should strive after noble beauty rather than mere sumptuous display. This principle is to apply also in the matter of sacred vestments and ornaments. Let bishops carefully remove from the house of God and from other sacred places those works of artists which are repugnant to faith, morals, and Christian piety, and which offend true religious sense either by depraved forms or by lack of artistic worth, mediocrity and pretense. And when churches are to be built, let great care be taken that they be suitable for the celebration of liturgical services and for the active participation of the faithful.
Source: Sacrosanctum Concilium (Vatican.va)