Intellegent and Joseph:
Are you saying that yeshiva bachurim of the past which included future Roshei Yeshiva (i.e., Rav Hutner, Rav Ruderman, Rav Shneiur Kotler,etc); Chief Rabbis and Rabbonim are to be criticized for not knowing this chazal? Candid photos show them in very stylish dress.
The yeshivashe styles included:
SHABBOS- SUITS: Iridescent; Plaid; Sharkskin; Neru; Bell Bottoms; Wide Lapels worn with wide ties; Narrow Lapels worn with narrow ties; Herring Bone; Tapered; Seersucker; Polyester. Also, Sports Jackets and slacks.
SHIRTS: Turtleneck, Colored and Patterned shirts; even on Shabbos.
HATS: Charcoal; Grey; Brown; actually any color; small brims; Velour.
It was also very rare to see bochrim in litveshe yeshivos sporting peyos behind their ears or with beard growth.