Uh oh, I'm not a tradtionalist, so take this with a few pinches of salt. I wear sweaters with kilts often. Here are my usual stand by's:

-V-neck solid sweater in complimentary color, white button down dress shirt,with or without tie.

-Turtleneck solid color sweater with tweed Braemar jacket

-"Commando" style crew neck sweater, solid color (usually black) with dress shirt under it

-"Commando" style V-neck sweater solid color (again usually black in my case) with dress shirt under it.

-V-neck sweater vest, solid complimentary color with white dress shirt, with or without coordinating tie.

I enjoy wearing sweaters for a more than casual look, but not as "pipe band looking" as just wearing a black vest.

2 bits from a caber thrower.