I have lots of cardis, mostly more fitted button-up crewnecks, And then I have a few dresses, mostly v-neck. The hardest thing for me is not matching the silhouettes but the necklines! Are there guidelines for putting necklines together?

Today before even reading YLF I was going to do a cardi over a sheath dress, but the necklines were clashing and I got frustrated with trying to figure it out...