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That would be really difficult to do as no two dresses are the same size. Same for male clothing to be honest!

Yes, it's a disaster area. I'll just plug a small web app written by a friend of mine that addresses this problem: http://sizes.darkgreener.com/

It uses least squares regression to work out, given your actual measurements, what "size" label from which shops is likely to fit.

This is great. Would your friend be interested in discussing a collaboration? I'm looking to build similar functionality into HipStat.