Suit and tie in the pulpit unless it is very hot, in which case shirt and tie. On rare occasions remove tie in hymn/psalm before sermon due to extreme heat. Who designed our church building with a glass roof? Imbeciles! I blame that Robert Schuller fellow.
Out of the pulpit - whatever. I will always make sure I have clean trousers and shirt on if I am doing anything church related but it is pretty casual. When I am cleaning the church building I may even be wearing shorts and a t-shirt. It gets hot in there!
One church planting pastor I knew NEVER did ANYTHING without shirt and tie on. They had managed to acquire an old chapel for meetings, and he was down there bringing it back into use day by day, sanding the pews. I will never forget going over to greet him, and being amazed that underneath his wood-stained t-shirt there was... a shirt and tie!!