Girls, Are sleeveless or single strap maxi summer dresses in style for the summer?

I am considering buying some maxi dresses without sleeves for the summer. They look so comfortable. Will they get too hot, or are they relatively cool. It looks like I can wear them for several different occasions. Also, I am 5 feet 7 inches tall. It looks like they run really really long. Will they be too long for a girl of my height?

Girls, Are sleeveless or single strap maxi summer dresses in style for the summer?
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