A crowd heads toward Wimbledon.Chiara Luxardo for BIWimbledon, the world's most prestigious tennis tournament, has an unmistakable aesthetic.When Joshua Nelken-Zitser went for the day, he spotted three fashion choices again and again.During a heatwave in the UK, structured straw hats and smart, white linen were popular.Wimbledon brings to mind competitors grunting in perfectly pressed tennis skirts and polo shirts, impeccably dressed umpires def…