This is my mommy version of a 'day to night' outfit, because, let's be honest, I'm not going anywhere! The most exciting place I'm going on a week night is on a bike ride with the baby to the pier. Which is fantastic! But not extremely glamorous. So outfits like this that are able to be converted from chic to comfortable are perfect.
So the top I JUST bought from Banana Republic so I don't understand why I can't find it, but these Topshop tanks are similar and I just ordered the bright pink one (waiting for it in the mail!). They have tons of colors, the neon pink and blue are my favorite. Or if you have fairer skin they have some amazing pastels (here and here) that I think would look fantastic.