How snug should the band feel? I just measured myself with help from my husband, and ordered a new size for myself. It's down a band size and up quite a bit in the cups (of course.) 

I tried one on this morning before I cut the tags off, and the band is pretty snug. In fact, it's SO tight I'm starting to second guess the size I came up with from the Bra Size Calculator in the sidebar. Am I just adjusting to a correct size? How can I know if I need to return these and go up a band size?