That he might present it to himself a glorious church, not having spot, or wrinkle, or any such thing; but that it should be holy and without blemish.
Note 12 at Eph 5:27: Some people see the church as getting weaker and weaker with Jesus snatching it out of the earth just before it dies. That's not what Paul presented here. The Lord is not coming back for a weak, pathetic, and defiled bride. He's coming back for a glorious church (see note 7 at 1Co 15:25).
Certainly, we are supposed to be as chaste and holy as possible in the flesh for the Lord, but the gloriousness and victory described here is beyond our actions. This is describing the spiritual condition of the church that exists regardless of our performance (see note 10 at 2Co 5:18).
Note 13 at Eph 5:27: The Greek word "RHUTIS" was translated "wrinkle" here, and it means "a fold (as drawing together), i.e. wrinkle (especially on the face)" (Strong's Concordance). So, this is not talking about a wrinkle as in clothes, but a wrinkle as on the face. It is a word picture that describes the body of Christ as not being worn and weather-beaten. We are glorious in the spirit realm and in the sight of God.
Note 14 at Eph 5:27: A good wife wants to be glorious, without spot or wrinkle for her husband. She will stop at nothing to make herself beautiful. In this passage, the difference is that the bride can do nothing to make herself beautiful. It was the work of Christ upon the cross, as He gave Himself for the church, that made her washed, cleansed, glorious, without spot or wrinkle, and set apart to Him.