What To Wear to Six Flags in 68 degree weather?

I'm going to Six Flags tomorrow with my sister, her boyfriend & my best friend. We're going to the one in Gurnee, Illinois but it's supposed to be partly cloudy with a high of 68; that's where I'm confused. I was planning on wearing shorts with a muscle tank from Victorias Secret but with it being 68 degrees, would I be too cold? Should I bring a light columbia jacket? & also, what to do with my iPhone since none of my pockets have buttons or zippers?
Any tips are appreciated!

Bring a small wrist bag and put your iphone in it. & i suggest you could wear shorts, but i mean, you re gonna walk and ride a lot of rides, so i'm Pretty sure your body is gonna have a hot temperature because of all the riding things your doing, so its lets likely your gonna be cold. But if you are planning to wear shorts, you should bring a jacket ( just in case). Instead of tank, i would go with a tee.

I would say what you're wearing is fine. I think you should bring your jacket and also bring a draw string bag to put your jacket and phone in.

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