Replying to Scott Apparel - Size Chart

Hey,
I'm about to buy a one piece suit. It's a Scott Rocco Jump Suit. I'm 1m70 tall (little less than 5ft6) and I weigh 143lb. The size of the suit is L and the guy who's selling it to me send me some pictures of him wearing it and it's too tight for him but he's 5ft6 and 220 lb. I'm wondering if it would be to big for me? I want something baggy that let me free to move, but not a sleeping bag.
I searched for a size chart but I did'nt find it... so if you have ever had some Scott jacket or pants can you tell about the sizing of their clothes.
Thanks