Ok - I am trying to get on the bandwagon, and get on with re-creating my wardrobe. My question is re: v-neck sweaters - do they always have to be layered somehow?

What I'm asking is if a v-neck sweater needs some sort of layer underneath it? Or can you wear a v-neck sweater all by itself with a necklace and possibly another layer over it (perhaps a jacket or what have you) ?

I am asking this question because I found some v-neck sweaters that look pretty good on their own (no layer underneath), but when I try to add in a shirt underneath, it doesn't look so good. Sizing up with the sweater results in boxy-ness, and I guess I'm just unclear as to how to wear a v-neck sweater.

How do you wear v-neck sweaters?