That blouse is pretty.

But I think you may have taken the example of my own dress a bit too literally. I wasn't suggesting that you necessarily buy a navy or black dress or one with the precise fit of my dress. Rather, I was suggesting that having some dressier pieces in your wardrobe might be useful even if you can't wear them to work or ride your bike with them. Pick a cut and color that flatters you or stick with separates if you prefer. The point is that you will likely find it helpful to have those options when you need them.