There was a German company that tried this using a webcam and a Compact Disc (for size reference).
I still think the best solution is to measure the normal tailors measurements with a tape, upload them, and then have manufacturers upload the exact measurements of their clothing in corresponding areas.
Crowdsourcing would allow people to mention wash shrinkage, and tolerance delta's for items.
Be cool to say I'm X size, and this is my favorite shirt. Show me more that are of similar measurements.
brb, going to start coding.