I have a son, 14 years old, 6'3", 250 pounds and size 15 feet. And he's still growing. He is your typical offensive tackle on football. The problem is getting riding gear to fit him. The boy has really thick thighs. Right now he has fox pants with a 38" waist, which is wider than he needs in the waist, but they are super tight on his thighs. Are there riding pants that are a little more "generous" in the thigh area? I don't want to have to go to a 42" waist just to get something big enough in the thigh for him. Thanks for any help.