I usually wear a 34B and, based on prior reviews, ordered a 36B.  It just fits, but perfectly so.  The bra is made of seemly sturdy lace that is soft, not scratchy as some can be.  It is also much more sheer (see-through) than I expected.  I ordered the beige, but I would call it more of a cream myself.  It feels firm and supportive, but doesn't pinch or scratch.  Good deal!