dart: a tapered tuck made in dressmaking
tuck: a narrow flattened pleat or fold that is stitched in place
fourth lateran council: the Lateran Council in 1215 was the most important council of the Middle Ages; issued a creed against Albigensianism, published reformatory decrees, promulgated the doctrine of transubstantiation, and clarified church doctrine on the Trinity and Incarnation