Ribbons instead of pins, and such.

[Nervous Jock]

The ribbon rosettes on the kilt apron are military and worn by the officers and NCO's of the regiment, only. They are also worn by the Pipe Major and Drum Major. The Argyll & Sutherland Highlanders wore an embroidered panel with the rosettes attached to it. The Black Watch wore bows, as does the present Royal Regiment of Scotland.

The bows you also mention are also referred to as Rosettes

[Nervous Jock]

from an earlier post of mine

These rosettes are specific to The Black Watch, this one dates back to the 19th century. In those days Regimental Colonels had to purchase uniforms for their soldiers out of their own pockets and much money was spent trying to make thier troops look as grand as possible.

In an attempt to save money at one point one Colonel decided thate the overlap in the apron of a kilt was unnecessary and just a waste of material. Fine in principle but embarrassing in public having just purchased a new Regiments worth of kilts the Colonel was somewhat concerned that he was going to have to purchase a further regiments worth of kilts to solve the problem until a young officer in the unit suggested tying the front to the back with some green ribbon hence the rosettes were born. This is the reason the rosettes are somewhat less "grand" than those worn by the Argylls.

[thescot]

I rather wish the rosettes weren't purely military because I really do like the way they look, especially the simpler Black Watch or Irish versions. The black (at least I think they're black) on the saffron kilts look very stylish yet understated to me.

But then I do have a weakness for uniforms and such.