Need to know what size snowboard pants to buy?

i am just going to start snowboarding this year and i need to buy the apparel before i go out so i have never tried on pants before and want cyber monday sales so i have a 36 inch waist but i need loose fit in jeans because i have thick legs so what size pants should i get i think a large but scared they will be to tight around the legs so what do you think do snowboard pants run tight across the legs?