Preppy menswear “has its roots in the Ivy League style of dress,” which started around 1912 and became established in the late 1950s. (Wikipedia)
According to WikiHow:
Want to dress in a clean-cut, polished and preppy fashion? All you have to do is cultivate a classic, simple look…. The easiest way to look preppy is to dress in simple, preppy colors like navy, white, and crimson…. Pick items that are cut somewhat conservatively. Avoid revealing clothing…. Preppy outfits are relatively simple in nature. They usually come down to a few classic clothing items that never really go out of style. If you want to look preppy, stock up on some basic essentials for your wardrobe . . . Polo shirts . . . oxford shirts . . . khaki pants . . . A patterned or solid colored button down shirt“
If you’re a man who wears polo or button-down shirts, or khaki pants, cargo shorts or neat jeans, you should know that you’re a despicable neo-Nazi!