Sounds fine to me. You want the jacket to come well down over your ass, otherwise you'll get snow down your pants all the time.
The pants wont be an issue when you have boots on.
What feels like a normal fit when you initially try outerwear on, is in practice generally too small. When you have all the gear on and some layers and stuff in your pockets you really want plenty of room to move and so you don't overheat.
I would wear medium for a good fit if I was wearing the jacket with everyday clothes but large or xl is by far the better feeling and looking fit for on the slopes. You actually have to go quite extreme before it looks too big.
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