Not to your clothes, but in sets? Like earrings and necklace and bracelet from the same set? I have a friend who will only wear jewelry in sets. I find that way too matchy matchy but often have a hard time figuring out how to wear two or more non-matched items, which is why I usually have on either earrings OR a necklace, rarely both.

Any guidelines on this? I don't mix gold and silver. I'm just figuring out necklines/necklaces and other accessorizing - finding lots of holes (like I have no long necklaces!)....