to just cycling in ordinary everyday clothes that you would wear to work?

If you don't wear everyday clothes when cycling (I'm talking about cycling for transportation, commuting), isn't it strange to run around in cycling clothes all day long? Or do you change everytime? What if you just go for a coffee or to the cinema?
It just doesn't sound very practical to me.
I actually have 2 prs. of business wear pants of which 1 pr. I wear.. if I am not wearing a pr. of black jeans or a black, above knee light thin style black skirt.

That is all, for my bottom part of my business wear. I paid about $80.00 for the black dress pants. A light wool gabardine that is also suitable for summer as well winter. It requires dry cleaning if they get dirty. Honest, here in our city it's dry prairie city with sand used by snow crews during winter and just blowing around. I get smudges just from accidentally brushing my panniers against the pants.

I dunno, it means cleaning my bike too often.

When I go shopping on bike, usually I change into cycleable wear which means cheap (no chamois) tights (they're not cycling, just $25.00 lycra tights), etc.

I'm dressed really in my oldest clothing at home. So I'm not presentable to go to a store.. I have to change anyways to leave home.