What should I wear on the weekend?

There’s this really handsome man who’s attending a meetup group activity to an art gallery and I want to hit on him. I’m mildly pretty, in my early thirties. It’s summer here and I have a floral blue pastel dress, a black tulle dress and a navy blue tulle dress. All of them look good, except the first is casual, the black is formal and the blue is in between and matches my eyes.

What should I wear on the weekend?
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