Originally Posted by PG2G
How about a polo under the sweater instead?
I don't see that working for the most part, although I have worn a polo with a short collar under a zip-mock-neck sweater to good effect. Don't try to arrange the polo collar neatly, that will look geeky.
If you want a similar option, try something like the leisure shirts from AA, BR makes a good Pima version that goes on sale for like $30. I got two last year and they are much better than the AA ones. They work very well under a V-neck. I think for the most part a V-neck needs either nothing or a semi-structured collar sticking through.
PS: this is a good chance to wear a tie, if you never get the chance. Only the knot and a bit of tie will be showing and you don't need to button the top button. I've gotten lots of compliments on doing that.