The little that I know:
From what I remember thirty years ago the bochrim who considered themselves yesivish for the most part had peyos behind their ears like today. The VERY Yeshivish crowd had “Brisker Peyos” The percentage of kollel yungerleit who had beards was smaller but not so much smaller than today.The Chidusay Harim on Shas was commonly learned in Litvish yeshivos. (There is even a GRNA”T answering a kasha in it.)Long malbushim and bend up hats are no more common today than they were then. In fact frocks and homburgs are LESS common than thirty years ago in yeshivish circles.