My son just turned 14 and just went through a growth spurt putting him at 6'1, he's also thin as a rail. Up until now we've done well buying his jeans in JC Penny's boy's section. We have gotten to size 20 regular, which is their largest size, since this latest growth spurt tho I'm at a loss, they don't make adjustable waist for men's jeans but in order to get a pair long enough for him I have to get the bigger waist size. I do have a sewing machine but am not quite that skilled with it yet. Any ideas or suggestions would be greatly appreciated