I have the Cabelas light mag waders... best waders on the market(colder temps go with the ultra mags) I wear size 13 shoe and have size 12 waders they fit well but are still a bit large(I'm 6'2'' 200 lbs). You can't beat cabela's customer service either. They will replace your waders no questions asked if they get a leak...

on a side note if you buy a pair that are too large and baggy the inside of the legs will rub and cause a leak in no time. Make sure they fit snug but comfortable. Best bet would be to try them on first if at all possible.