CANADIAN MAMAS

hey ladies! I need advise on snow suits! My daughter is currently 6 months and old man winter is almost here, so what do you guys use? a two piece?(snow pants and a winter jacket) or a snowsuit? I'm trying to think of practicality, warmth & comfort for her all in one, she's big too she's almost 20lbs, when we go grocery shopping for example she sits in the cart does she keep that all on when we are in the store? Will she get to hot? I'm defiantly confusing my self now lol help!