If i may share my opinion let me say that i don't think there is anything wrong with wearing nice clothes or rags if that's what you have. Suits are not needed but nothing wrong with them either. But Paul did say something about dressing in expensive clothes. But a suit doesn't need to cost a fortune.
I think the important thing to remember is what Paul and James say about clothing, make-up and Jewelry. Paul said to dress modest, not like the world today dresses, not in a provocative manner. I think some women and men should clean up how they dress. And if you are one of those churches that demand that people dress up in nice clothing you might want to consider what James said.
1Ti 2:9 In like manner also, that women adorn themselves in modest apparel, with shamefacedness and sobriety; not with broided hair, or gold, or pearls, or costly array;
1Ti 2:10 But (which becometh women professing godliness) with good works
Jas 2:1 My brethren, have not the faith of our Lord Jesus Christ, the Lord of glory, with respect of persons.
Jas 2:2 For if there come unto your assembly a man with a gold ring, in goodly apparel, and there come in also a poor man in vile raiment;
Jas 2:3 And ye have respect to him that weareth the gay clothing, and say unto him, Sit thou here in a good place; and say to the poor, Stand thou there, or sit here under my footstool:
Jas 2:4 Are ye not then partial in yourselves, and are become judges of evil thoughts?
Jas 2:5 Hearken, my beloved brethren, Hath not God chosen the poor of this world rich in faith, and heirs of the kingdom which he hath promised to them that love him?
Jas 2:6 But ye have despised the poor. Do not rich men oppress you, and draw you before the judgment seats?
Jas 2:7 Do not they blaspheme that worthy name by the which ye are called?
Jas 2:8 If ye fulfil the royal law according to the scripture, Thou shalt love thy neighbour as thyself, ye do well:
Jas 2:9 But if ye have respect to persons, ye commit sin, and are convinced of the law as transgressors
