and…
here are some quotes from the early Church fathers from the first five centuries of the Catholic Church:
He was the ark formed of incorruptible wood. For by this is signified that His tabernacle was exempt from putridity and corruption." Hippolytus, Orations Inillud, Dominus pascit me (ante A.D. 235).
“This Virgin Mother of the Only-begotten of God, is called Mary, worthy of God, immaculate of the immaculate, one of the one.” Origen, Homily 1(A.D. 244).
“Let woman praise Her, the pure Mary.” Ephraim, Hymns on the Nativity, 15:23 (A.D. 370).
“Thou alone and thy Mother are in all things fair, there is no flaw in thee and no stain in thy Mother.” Ephraem, Nisibene Hymns, 27:8 (A.D. 370).
“O noble Virgin, truly you are greater than any other greatness. For who is your equal in greatness, O dwelling place of God the Word? To whom among all creatures shall I compare you, O Virgin? You are greater than them all O Covenant, clothed with purity instead of gold! You are the Ark in which is found the golden vessel containing the true manna, that is, the flesh in which divinity resides.” Athanasius, Homily of the Papyrus of Turin, 71:216 (ante AD 373) .
“Mary, a Virgin not only undefiled but a Virgin whom grace has made inviolate, free of every stain of sin.” Ambrose, Sermon 22:30 (A.D. 388) .
“We must except the Holy Virgin Mary, concerning whom I wish to raise no question when it touches the subject of sins, out of honour to the Lord; for from Him we know what abundance of grace for overcoming sin in every particular was conferred upon her who had the merit to conceive and bear Him who undoubtedly had no sin.” Augustine, Nature and Grace,4 2[36] (A.D.415) .
“As he formed her without any stain of her own, so He proceeded from her contracting no stain.” Proclus of Constantinople, Homily 1 (ante A.D. 446) .
“A virgin, innocent, spotless, free of all defect, untouched, unsullied, holy in soul and body, like a lily sprouting among thorns.” Theodotus of Ancrya, Homily VI:11(ante A.D. 446) .

(again, same source I sited above.) Please read it.