The style known as Trad owes a lot to the Ivy League style for its heritage. However, this traditional American style was shaped by not only heyday Ivyist, but by each generation after that was interested in the traditional American look.
Just this week I read an interesting post that covered late 90’s fraternity style. This post featured Wallabee Clarks and polo shirts. Two items that were also included in the, “Definitive Late 70s Prep Checklist” post. This post on the 90’s in conjunction with the late 70’s Prep post helps to illustrate the path from Ivy style to Preppy to Trad.
I encourage you to head over to Red Clay Soul to read the article: LATE 90’S – EARLY 00’S FRATERNITY STYLE