Karen RD answered:
Thank you, Susie! The pattern was from Ottobre magazine, issue 4/2013. My sons are very skinny so the 170 size fit my youngest son even at age 16. I did make changes to the pattern: lengthening them, making them more a boot cut, and making the belt loops as per Angela's class. Ottobre sized the pattern up 2 sizes for me for a nominal fee. If you have any other questions, I will be happy to answer them.