Buckles are still a matter of personal choice as to design, each style reflects not only the persona that you are portraying but your own style too.
The Great Thistle buckle is a bit larger in overall size but will fit our latchets. 2 1/2″x 2 1/2″ with an opening that will accept 1 1/4″ latchet. Brass,
The Middle class and Tradesmen might go for more design for their shoes. After all, they got passed the large silk bow for their shoes several decades earlier. For the conservative man might choice the Basketweave, Swill or Rope style in either Brass or white metal.
The Upper class might show off more elaborate buckles such as the Tudor, Swirl, Pierced, Great Thistle as they were or for the final show of financial accomplishment, have them studded with gemstones. In our case, we use crystal in gem colors. Brass or Silver metal is still, what goes with what you have to wear.