concinnity (n.)

"state of being well put-together, skillful and harmonious fitting together of parts," 1530s, from Latin concinnitas, from past-participle stem of concinnare "to make ready, make into," from concinnus "set in order, neat," from assimilated form of com "with" (see con-) + second element of uncertain origin. Related: Concinnate; concinnous.