What he said.
h/t to Tim Challies.
I'd go a couple of steps beyond the author of the linked piece, and state that it's not only some pastors that are obsessed with looking "cool", but some churches and some entire congregations.
I'm not advocating turning away the fashionably dressed, or the too-hip-to-even-be-called-hipsters, nor eschewing a particular church because they have a coffee bar. Rather, I'd question those whose commitment to the faith is less than their commitment to the latest glasses frame shape.
We are not of this world. -John 17:14 - 16
We are not to conform to this world -Romans 12:2
We are not to work to please people, but to please God. -Galatians 1:10
There is more, but you get the point. We should not be as concerned with our outward appearance as with the faith we profess.
Note I'm not saying we should all go around in 70's polyester with sky high teased hair (though if you want to, I'm okay with that). A clean, put together appearance is expected. It's when we care more about the image we project than the One whose character we are supposed to reflect that we get into trouble.
When people look at you, which speaks louder, the character of Christ in you, or the clothes on you?