Interesting how stories get started and turned into tradition and/or myth. I am not sure how accurate the Queen Victoria story is as regards tradtion, but for whatever reason the tradition has been to wear your kilt pin (of whatever style) bottom right of your front apron, a couple fingers in from the edge and a couple inches up from the selvedge, usually centered on a prominent stripe in the tartan to add visual accent. Military units have also used ribbons, often multiple at times, and usually worn them higher on the apron edge nearer the bottom of the fell and lined up vertically---another attractive option. Many here on the forum have experimented with alternative positioning and even angling of kilt pins, many with great success from an appearence standpoint, although I doubt these follow any particular tradition, merely personal preference. In addition there has been broad variation in tastes as to what can make up a kilt pin, also with some very artistic outcomes and colorful appearences. How traditional? who knows, and in many instances and people's minds, who cares. If it looks good, is not offensive, worn in good taste with your kilt, I doubt anyone would give you more than a second look, except in very formal or particular circumstances (weddings, uniforms and such). Although I am not a modernist by any means, neither am I a strict traditionalist, so I am wont to try some new things sometimes, and I like some of the newer suggestions, personally.

Jock or Mac might chime in here with the trads' opinion.