More to explore:
J. Stern Designs: Adjusting Misses' Jeans - Part I: Legs and Front Pocket Style
How to fix old jeans with holes for the "destroyed" broken-in look. Pretty thorough DIY instructions using interfacing and a sewing machine.
Loads of options from the 4 basic dress designs: Practical Dress Design Mabel Erwin
Guide for four ways to turn pants into shorts, with very simplistic photos and instructions. Thank you for no more shorty shorts.
A bunch of Trouser/Pants Pattern Alterations from Cation Designs
How to Hem Pants with the Original Hem - I can't WAIT to try this on my jeans!
Oh that's clever! How to hem your jeans professionally.
How to Tweak a Pattern
upper back/shoulder alterations Review this information, it is very important it shows the alterations needed to the back/shoulder that if not corrected it affects the fit of front of garment.
The Sewing Corner: How to Draft Stereo-butt/Non-mono-butt Jeans -- This is mostly for skirt-pattern-to-pants transitions, but nice guide for drafting from scratch, as well.
Do you have a pair of jeans you can't live without? Can't bear the thought of parting with them? Clone them!