Jesuits do not have an official habit. The society’s Constitutions gives the following instructions: “The clothing too should have three characteristics: first, it should be proper; second, conformed to the usage of the country of residence; and third, not contradictory to the poverty we profess.” (Const. 577)
Historically, a “Jesuit-style cassock” became “standard issue”: it was wrapped around the body and was tied with a cincture, rather than the customary buttoned front. A tuftless biretta (only diocesan clergy wore tufts) and a ferraiolo (cape) completed the look.
Today, most Jesuits in the United States wear the clerical collar and black clothing of ordinary priests, although some still wear the black cassock. Jesuits in tropical countries may use a white cassock.