This is a great value, and the bra is comfortable and gives me a nice sexy shape.  I don't remember what my "usual" size is because I've been pregnant and/or nursing for the last 2 years.  Before pregnancy I was a 34c, and maybe after a 34DD?  I don't know, either way, the band is too big even on the the tightest setting, and when I was really engorged at the beginning, the cups were way too small.  I wear a large.  Right now at 34 weeks pregnant and nursing, the cups don't cover my nipples and the band is loose despite the increased size of my ribcage during pregnancy.  I really wish this company offered more tailored sizing because I need more nursing bras.