I live in India and am looking to make some online buys that some friends living in the US can bring down for me when they travel. I'm a US size 4, but can't really figure out how the sizing works for the Ann Taylor cross over halter top (http://www.anntaylor.com/ann/c.....;cid=A0001) where the sizes are measured as XS, S, M etc. Any advice for me or should I steer clear from making a bet like this as I have never tried on any of their clothes.