That's a good point, but also raises a question - at least for me - about the difference between Trad and Ivy.Well, technically, it kind of depends on the college.
You expressed that beautifully. Also in my experience devotees of Ivy and its more youthful counterpart, prep, were more rigid than American style Trad dressers. If you showed up at a school event at certain places wearing a Pendleton Topster, a Rooster tie, or shoes, even longwings, other than Weejuns you were viewed as tipping into counterculture!That's a good point, but also raises a question - at least for me - about the difference between Trad and Ivy.
IMHO (and I mean that, I am no expert), I think of Ivy clothes as those that gained acceptance at the ten or so Ivy colleges in the '50s through the pre-late-'60s, but also the clothes those graduates are most associated with wearing when they entered the work world in the '50s and pre-late-'60s.
When I think of Trad clothing, I think it's a wider universe that includes the clothes most college (any college) kids and younger people in the '30s - pre-late-'60s wore - and as above - at college and when they entered the work world. Trad is more "just classic American" clothing to me.
Hence, Ivy is a subset of Trad. I'm not saying the above are perfect definitions, just some ideas I keep in my head to, for example, say that pleated trousers or a bomber jacket can be Trad, but not Ivy.