As office dress codes relaxed, a new pressure to fit in emerged—this time, through ultracasual clothes.

Six months after Luigi Mangione was charged in the fatal shooting of UnitedHealthcare CEO Brian Thomson, to which he has pleaded not guilty, state prosecutors released copies of his “manifesto.” ...

Wondering what ‘business casual’ actually means these days? We asked pros to decode the dress code and share their go-to garb ...