Yet when I say 'darts,' the term is used rather liberally. Frankly, I don't know what to call this. I've sewn horizontal darts into my jeans for years, and they are what you'd expect if you're familiar with darts on men's shirts. The goal is to reduce and shape the garment to fit better, but I use them on jeans because I don't like losing the ankle hems by folding them under. I also don't like the excess material that ends up there.
Contrary to having plotted the entire dart as seen in the pictures, I've decided to employ them differently this time around. Instead of sewing the entire section shut into a 'closed eye,' I've sewn just the center points together. By doing so, the fabric can drape more freely around the knee. At the same time, the reduction in the leg length is maintained where it's supposed to be (the back).
Due to the height of the 'pinch dart,' (good a name as any), there is a jodhpur silhouette that forms at the thigh where the excess denim drops forward. The folds gather at the knee, and push down in opposition to the darts. The resulting drape gathers rather nicely at the shins and ankles.
I typically wear a 28x30 in jeans, but for this particular alteration, I bought a 28x32 in order to guarantee enough length to work with. The cut is a boot fit made by Guess Jeans called "Jayce Slim Bootcut." I'm curious to see how these jeans age with this particular modification. Since the denim is so raw, there will definitely be some interesting whiskering.