The king's daughter - This evidently refers to the bride, the daughter of the foreign king. The verse contains a description of her beauty - her splendor of attire - before she is brought to the king, her future husband. She is represented here as in the palace or home of her father, before she is conducted forth to be given to her future husband in marriage. Is all "glorious." Is all splendor or beauty; is altogether splendor. There is nothing that is not splendid, rich, magnificent in her appearance, or in her apparel. As seen in Psalm 45:9, she is clad in gold; she is surrounded by honorable women - the daughters of kings Psalm 45:9, and encompassed with the rich, Psalm 45:12. As seen here, she is in her father's house, adorned for the marriage, and to be brought to the king, her future husband, attired in all that could give grace and beauty to her person. The allusion here, as referring to the church - the "bride of the Lamb" - "may be" to that church considered as redeemed, and about to be received to heaven, to dwell with its Husband and Saviour. Compare the notes at Revelation 19:7-8; notes at Revelation 21:2, notes at Revelation 21:9.

Within - This does not refer to herself, as if she was not merely splendid in her attire, but holy and pure - glorious and lovely - in "heart;" it refers to her as seen while yet "within" the palace or home of her father, in her own dwelling. The Hebrew word - פנימה penı̂ymâh - means properly, "at or by the inner wall of a house, room, or court; that is, opposite to or in front of the door, and of those entering." Gesenius, "Lexicon" As seen in her dwelling - within the palace - in the most honored place - she is arrayed in gorgeous apparel, and adorned as becomes a king's daughter about to be married.

Her clothing is of wrought gold - Gold embroidery. See Psalm 45:9. That is, she is arrayed in the richest apparel.

Psalm 45:13 Parallel Commentaries

On virtue --All virtues Given with God in this Degree of the Prayer of the Heart.
This is the short and the sure way of acquiring virtue; because, God being the principle of all virtue, we possess all virtue in possessing God. More than this, I say that all virtue which is not given inwardly is a mask of virtue, and like a garment that can be taken off, and will wear out. But virtue communicated fundamentally is essential, true, and permanent. "The King's daughter is all glorious within" (Ps. xlv. 13). And there are none who practise virtue more constantly than those who acquire …
Jeanne Marie Bouvières—A Short Method Of Prayer And Spiritual Torrents

For not Even Herein Ought Such as are Married to Compare Themselves with The...
10. For not even herein ought such as are married to compare themselves with the deserts of the continent, in that of them virgins are born: for this is not a good of marriage, but of nature: which was so ordered of God, as that of every sexual intercourse whatever of the two sexes of human kind, whether in due order and honest, or base and unlawful, there is born no female save a virgin, yet is none born a sacred virgin: so it is brought to pass that a virgin is born even of fornication, but a sacred …
St. Augustine—Of Holy Virginity.

If, Therefore, You had not as yet Vowed unto God Widowed Continence...
23. If, therefore, you had not as yet vowed unto God widowed continence, we would assuredly exhort you to vow it; but, in that you have already vowed it, we exhort you to persevere. And yet I see that I must so speak as to lead those also who had as yet thought of marriage to love it and to seize on it. Therefore let us give ear unto the Apostle, "She who is unmarried," saith he, "is careful about the things of the Lord, to be holy both in body and spirit; but she who is married is careful about …
St. Augustine—On the Good of Widowhood.