Ivy League Group Agreement to all intercollegiate sports, effective with the 1955–56 basketball season. This is generally reckoned as the formal formation of the Ivy League. As part of the transition, Brown, the only Ivy that hadn't joined the EIBL, did so for the 1954–55 season. A year later, the Ivy League absorbed the EIBL. The Ivy League claims the EIBL's history as its own. Through the EIBL, it is the oldest basketball conference in Division I. As late as the 1960s many of the Ivy League universities' undergraduate programs remained open only to men, with Cornell the only one to have
Ivy League trends and styles have emerged from Ivy League campuses over time, and fashion trends such as Ivy League and Preppy are styles often associated with the Ivy League and its culture. Ivy League style is a style of men's dress, popular during the late 1950s, believed to have originated on Ivy League campuses. The clothing stores J. Press and Brooks Brothers represent perhaps the quintessential Ivy League dress manner. The Ivy League style is said to be the predecessor to the preppy style of dress. Preppy fashion started around 1912 to the late 1940s and 1950s as the Ivy League