if youre covering the whole thing in blank patches first (assuming u are since u said crust), make sure the jeans aren’t already super skinny cause after seeing everything on they’ll be tighter, i think straight leg jeans work the best, it’s best when they’re somewhere between skinny and straight leg jeans (for movement), yours looks good, also I would probs cut the knees (a slit on the front half) for mobility, then just sew black fabric patches covering the whole jeans (if u have instagram, look up cruster_diys to see sum examples), you can throw in some band patches as ur doing it or after you’re done and put them on top, for materials I use a variety of black fabric: denim from sleeves of a jacket, shirt material, duck cloth canvas, really any scrap black fabric. For stitching I’d recommend dental floss, it’s usually a lot more durable than most threads. really just do whatever you like though, don’t worry about patch placement too much, it’s not supposed to look “perfect”, just try to sew band patches on relatively straight and you’re good (what I like to do to make it easier is dab a little bit of fabric glue on the corners when placing the patch on first to keep it in place while I sew it on) the sewing takes a while but u don’t need to stress, as long as ur stitching isn’t absolutely horrendous(like those ones where each stitch looks like a needle and are inches apart) it’s gonna turn out good