Also interesting to note:
1) The pointed tip of his fold-down collar.
2) The taller crown height of the "derby" hat or bowler.
3) His boots/shoes (sans lacing or buttons) that might well be "congress" style with what appears to be one-piece fronts.
4) Are we sure there are specs in his right hand, or could that be both ends of a watch chain on his vest? Looks like the latter to me. Seems an odd grip to be holding spectacles....