I purchased this dress in black. I am 57 and 130 pounds and wear a 36b bra.  Based on other reviews I went with a US size 4 and it fits perfectly! I will probably need to go with flats or a small heel as far as shoes go. The dress hits a smidge above floor length on me. The fabric is indeed thin but it doesnt feel like it will fall apart. It feels like a nice, airy dress that will be great for the spring and summer. I was worried about the neck being droopy and cowl-like as described in other reviews. This was not the case with a size 4. As soon as I tried it on I knew Id be ordering another color!