These have probably been covered, although I'm not gonna go through 1250 pages to check:
Clip-on suspenders, especially with expensive trousers from Ambrosi, Liverano, etc. Why not Thurstons or some other real, buttoned braces?
Is it an inside joke?
Orange shoes. As a matter of fact, any pale shoes made of regular leather and not suede or buckskin. It just looks weird, especially with a darker outfit.*
Then again, contrast stitching rubs me the wrong way, too....