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I can't speak for the pants, but I am 5'10" and had the crash jacket in large and it is HUGE, bigger than many company's XL. If you weigh less than 160 or so, I'd get the medium in the crash jacket, but if you want it really baggy and are bigger you can get a large. I am 5'10" 190 lbs built more like a wrestler or line-backer than a skier and the large was still quite big on me.
THat being said, there is one for sale on Ebay currently.