As soon as Willie Muse was invited to his cousin’s wedding in June on Cape Codeightstorm, he Googled what the “beach formal” dress code meant.

The first item that popped up was a linen suit from J. Crew that consisted of matching shorts and a blazer.

Mr. Muse, 34, loved the idea of wearing shorts to a wedding. Summer events, in particular, have never been particularly comfortable for Mr. Muse, who lives in Brooklyn and works as a full-time content creator.

“I don’t know what to wear because I know I am going to end up sweating profusely by the end of the night,” he said.

But he was nervous that shorts would be considered too informal.

“The one thing you are worried about when you wear something different to the wedding is having people look at you instead of the bride,” he said. “I had a moment of panic.”

So he did what any good cousin would do: He wore the outfit to the rehearsal dinner first and ran it by the bride. “She didn’t say no,” he said, laughing.

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