I know kilt pins are considered "optional", but I rather like them and nearly always wear one. My question is this: is it improper to use a broach-style pin (like for a plaid) in place of a more normal kilt pin? I've seen some really interesting designs that are more in the broach category (mainly due to the shape - symmetrical/round rather than a more vertical orientation), but I've always stuck to more of a normal vertical kilt pin shape. Just thinking some variety might be nice, if it isn't too much of a faux pas.

As a follow-up question, if anyone does that, would be: are they typically be worn in the same place as a normal kilt pin (further up than in from the corner, kind of mirroring the proportions of the pin itself) or would it typically be more symmetrically inward from the corner (same amount up as from the side)?