What do you wear to church?

Depends if it's a baptism, wedding or funeral.

Usually a polo and long pants. 

Suit and tie. For a funeral the suit's dark and the tie black. For a wedding, a kilt outfit.

I went to a church building once about two years ago because I heard they were having a concert. It was terrible, and I left early.

I went to a church building in 2004 because I was invited to a dinner. Nobody was there. It turned out all the members were in some sort of a meeting, and I was the only non-member who showed up. The dinner started a half hour late.

Clothes usually.

just regular clothes, not into dressing up

I guarantee it involves a ruff and a codpiece. 

Where I am right now everyone wears shorts and capris along with flipflops and a T-shirt.  It's really great!

Knee length dress with exquisite pink silk lingerie.

My Church silk knickers.