I've wanted a collar necklace for at least two years now. The nice ones that I've seen are usually fairly extravagant with studding, pearls, or a design of some kind. Somehow, that brings up the price of these necklaces dramatically. I can't justify paying over 20 bucks for a piece of costume jewellery, especially one that has a good likelihood of just being a passing fad. Finally, I was able to find one from eFoxcity for under 10 bucks.
I think that the necklace looks like it was made for this top. And I would definitely wear the two together more often, but the top has buttons at the back of the neck. That means I can only wear this top when someone else is helping me do up the buttons. I might just start telling people that I'm sporting the new "trend" of unbuttoned clothes. "Uh, yeah...the top's supposed to be worn like that. I definitely did not miss the buttons at the back of my top...."
As a cheap clothing store, eFoxcity's got a pretty spiffy collection of men's shirts and wedding dresses too.