God looks deeper than clothes
Church gatherings are for worshipping God, hearing his word, praying, and encouraging one another. They are not a test of whether someone owns formal clothes. When Samuel was tempted to judge Eliab by his appearance, God reminded him that people look at what is visible, while the Lord looks at the heart (1 Samuel 16:7).
That doesn't make outward choices meaningless. What we wear can express care, gratitude, or consideration for others. But a smart outfit cannot make someone more loved by God, and worn clothes cannot keep someone from coming to him. Jesus welcomed people others often overlooked, including the poor and socially excluded (Luke 5:30-32).
But the Lord said unto Samuel, Look not on his countenance, or on the height of his stature; because I have refused him: for the Lord seeth not as man seeth; for man looketh on the outward appearance, but the Lord looketh on the heart.
Don't make clothing a measure of worth
James addressed this very practically. He described a church gathering where a rich visitor wearing fine clothes receives special attention, while a poor person in shabby clothes is pushed aside. James says that kind of treatment shows sinful favouritism, not faith shaped by Jesus (James 2:1-4).
So if a church has a usual dress style, it may be kind to respect it when you are able. Yet nobody should be shamed, stared at, or given a worse seat because they came in work clothes, jeans, school uniform, or whatever they could manage that day. The welcome of Christ is bigger than a dress code.
My brethren, have not the faith of our Lord Jesus Christ, the Lord of glory, with respect of persons. 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; 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: Are ye not then partial in yourselves, and are become judges of evil thoughts?
Modesty is about more than fashion
Paul encourages women to dress with modesty and sober-mindedness, placing more value on good works than on costly displays of wealth (1 Timothy 2:9-10). Peter makes a similar point, directing attention away from showy outward decoration and towards a gentle, faithful inner life (1 Peter 3:3-4). These passages do not set one universal style for every culture, age, or congregation.
They do invite all Christians, women and men alike, to ask honest questions. Am I dressing mainly to draw attention to myself, show off what I have, or make others feel small? Or am I coming ready to honour God and love the people around me? Those are heart questions, not a demand for expensive or formal clothes.
Come ready to worship
Some people enjoy wearing their best for church because it helps them mark the day as special. Others come straight from a shift, care for children, lack money for extra clothes, or simply feel more at ease in casual clothing. Faithful Christians may make different choices here.
A good rule is simple: wear what is reasonably clean, appropriate, and considerate for your setting, without judging people who make a different choice. Paul says that whatever believers do should be done for God's glory (1 Corinthians 10:31). So come ready to worship, listen, serve, and receive grace. That matters far more than looking impressive.
Whether therefore ye eat, or drink, or whatsoever ye do, do all to the glory of God.