Jeans made from broadly similar fibers sell across an enormous price range. Most of the difference sits in three production decisions that are invisible on the hanger.
Fabric is bought by the yard, not the garment
Denim is woven at mills that differ in yarn quality, weave density and dyeing method, and the price per yard between commodity and specialist mills differs substantially.
Ring-spun and open-end yarns produce different surface texture and wear characteristics, and the slower spinning method costs more to run.
Because a pair of jeans consumes a meaningful length of fabric, a modest difference per yard becomes a large difference per garment before any sewing happens.
Finishing is where the labor concentrates
The look of a finished pair comes from washing, abrasion, resin treatment and hand-applied detail, each a separate process step with its own equipment and labor.
Heavily finished jeans can pass through many stages, while a raw or lightly rinsed pair leaves the factory almost directly from the sewing line.
Environmental regulation and water treatment costs vary by production country, which is another reason identical-looking finishes carry different underlying costs.
Cutting yield decides how much fabric is wasted
Pattern pieces are arranged on the fabric roll to minimize waste, and a careful marker layout uses noticeably less material than a rushed one.
Directional or selvedge fabrics restrict how pieces can be placed, which lowers yield and raises the fabric cost per garment.
Grading a pattern properly across sizes takes engineering time, and skipping that step is one of the quiet compromises in inexpensive production.
Construction details cost time, not materials
Chain-stitched hems, felled seams, riveted stress points and consistent stitch density all take longer at the machine and require operators with more training.
Hardware quality matters less to cost than the labor of attaching it correctly, since a misaligned rivet creates a failure point regardless of the metal used.
These details determine how a garment ages rather than how it looks new, which is why the difference is hard to judge at the point of purchase.
Brand cost sits on top of all of it
Design, sampling, marketing and the markup structure of the channel add to the retail price independently of what production cost.
A garment sold through wholesale carries margin for both the brand and the retailer, while a direct-selling brand keeps a single margin on the same production cost.
That structural difference is why comparable construction can reach the shopper at prices that appear unrelated to each other.