Feel free to dress casually.
From what I’ve seen, most church websites and bulletins these days are very sure to include something like this somewhere noticeable. They want it to be clear: we’re not a stuffy old church that insists you dress like businessmen and Victorian ladies if you want to experience the presence of God. We know God as living in a personal relationship. So come as you are and enjoy fellowship among equals all in this together!
For what it’s worth, I appreciate that. The legalism which had built up in vast swaths of the Western church over the centuries about what to wear was stifling and unbiblical. Even now, you occasionally hear horror stories from old Baptist congregations: an usher scolds some single mother for her choice of attire, and she misses what might have been a redemptive moment. Such nonsense is a shame in the strongest and most condemning sense of the word.
Nonetheless, in our efforts to remove legalism and open welcoming doors to outsiders, I fear it’s easy to miss some of the good from the old tradition. The impulse that led people to dress up for church was deep. It definitely goes beyond the generic answered reason of “giving God your [culturally relative] best.” I think there are actually two areas of theological significance which can give the practice real meaning.
First, there is the idea of the sacred. In church, we are not members of a club. We don’t gather for some mere earthly thing we have in common, whether politics, hobbies, careers, or family relationships. We gather to worship God the Father Almighty, the transcendent One who is infinitely different from and superior to us. We come in the name of Jesus, His beloved Son who mysteriously unites human and divine natures in Himself in order to bring us to God. We unite in the power of the Holy Spirit, the very personal presence and power of the God who made everything and everyone. This puts us on holy ground. When we gather as a church (not, I should specify, just “in” a church), we are entering the presence of a Holiness which is set apart from anything else we know.
So when we dress differently than we do elsewhere, it can serve as a sign, especially when done freely and not legalistically. It can symbolize and point to the fact that Body of Christ is not just another function of human life, but is the point where the radically different life of God meets us. This, of course, doesn’t bind us to any particular kind of clothing. But when we, by our clothes and other, more important things (you know, like love for each other and praise of God), mark out church as sacred time and space before God, we testify to the world that we’re dealing with something, or better Someone, different than everything else. (As a side note, this idea is not compatible with our “Sunday best” simply being the same as our business clothes, or formal wear, or any other category. It sets itself apart, even perhaps undermining the traditional ideas of what special clothes make sense to wear for church.)
The other possible Christian significance to dressing up at church has to do with our identity. As a people born again, we live in hope of a resurrection to glory. We are now, and one day will be more fully, members of a new creation. Everything will be made better. Redemption will extend to every nook and cranny of creation, including our bodies. All will be beautified and perfected. When Jesus comes back for us, we will all be our best selves both inside and out.
To dress up, then, also serves as a sign of the new creation. No one can deny that, culturally relative as it may be, dressing up makes people look nice. In all but the rarest instances, we look our best when we dress our best. And while our looks aren’t the point, they can be a sign for ourselves in the world: we look like our best selves now in anticipation of how we will become our best selves when Christ returns, and in fact we are already our best selves hidden in Him. The visible points us to what is now invisible so that we can remember and witness to what Jesus has done and will do.
Of course, none of this is meant to construct a new legalism where we must dress up at church to make theological points. The beauty of the sign is at least in part in its freedom, showing that we have been freed by Christ into new creation, not forced. We must not submit to any yoke of slavery. But my point is rather not to throw the baby out with the bathwater. The legalism and formalism of yesterday’s “dress your best” church is and deserves to be dead, but that doesn’t mean we need to give up on the dress up altogether. We still have power to be signs if we want, or even to be signs by some other method. In any case, let each render to God according to his own conscience for God’s glory.