Thanks, Jer.

I bought that tie when I was a college freshman in 1969 and the prof teaching Calculus 1 told our class that ties having stripes with positive slope were relatively rare. I went shopping to find such a tie which I also hoped would include some of the excesses of Mod fashion from the Sixties. The tie I posted is what I came up with, and I was quite pleased with its red, white, and blue patriotic paisley, although I'd hoped for more width than I was able find. I've worn that tie for math tests, as student or as instructor, ever since.
IIRC, you posted a photo in some thread recently that had some colorful ties in it, at least one of which was silk.



(But could the "tie" that seemed most "psychedelic" to me have actually been bib overalls? On closer inspection I thought I saw what looked like a strap adjustment buckle.)
- GT