I notice many friends posting video clips of their pastors and teachers. Inevitably, the man is wearing jeans and an patterned shirt of some sort, sleeves rolled up and 2 buttons undone. More and more, this strikes me as wrong.
By wrong I don't mean sinful. I mean unwise and unfitting.
But first, why would a pastor publish a video of his message to his flock? As pastor, isn't he supposed to be tailoring his message to his group? Doesn't this lead to a celebrity status and the temptations that go with it? I understand many messages, especially in larger church settings, are more general - but the teaching and preaching/pastoring roles are at least in theory, different. But let's move on to the original point.
The casual dress, definitionally informal, says something. It says this is personal, this is not ceremonial, this is teaching. In work, the more important a presentation, the more formal the dress. The more ceremonial the occasion. There are introductions and places and so forth. When we throw all that out, the authority is stripped from the message. The pastor essentially is saying "this is something for you to consider" rather than "this is what we believe and then must do."
And therefore, that is why I believe a pastor should wear formal dress at the very least, and a robe (preferably white) as the best practice. Doing otherwise removes the authority that Jesus as King has demanded his messengers, his modern-day angels, to convey.