I got mine on sale at Nordies, Cricket. Last time I was at the Rack, they were full of them. I like them because the pendants are fixed into place and don't move around, so I don't end up with the clasp rotating towards the front (which always happens to me for some reason), and somehow they manage not to get tangled. They are Betsey Johnson.
It is actually a top Tansie! I don't like to "waste" my dresses just to run some errands and then have to wash them. For most weekend mornings when I'm running around to make appointments and do groceries, I don't mind wearing a knit top, but it's not something I wear when I want to feel really fabulous.