Hey, I'm pretty sure that Gucci loafers were listed in the Official Preppy Handbook (not the apparent unofficial rogue ones) as acceptable attire but perhaps that was only for Buffy and Muffy. Hard to believe, I know. And Preppy is part of Trad, right?
I don't know about the colored ones, but the black ones, with gold snaffle bit were very much a part of the 80's Lehmann scene. Every trader had a pair to wear off hours.