LOVE this dress.  I am a US size 16, 36DD bra size, 5'2 height and 195lbs.  I ordered the 2XL and it fit PERFECTLY (well besides it being too long, but everything is too long on me because I'm short :P).  You will need a slip with this dress because it's pretty see through.  I am ordering this dress in another color I love it so much!