When I go to davening during the week, I make sure to dress appropriately. Even if it’s a Sunday where I was doing housework, and was wearing jeans and a t-shirt, I’ll change for davening into a nice button-down shirt and regular pants.
On Shabbos, I wear a suit and white shirt. The white shirt is my item that is special for Shabbos. I won’t wear one during the week unless it’s for a special occasion.