Casino Attire?

I'll be going with my boyfriend to a casino for the weekend. From the movies and tv it looks like people get really dressed up to go to the casino.

How dressed up am I supposed to get? What's a good outfit idea to look good for my guy, but still look appropriate for casino wear?

I assume jeans are out, but am I supposed to wear a skirt, or a dress, or what?

Any advice will be helpful, thanks!
Casino Attire?
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