Apply a blue base color. Soho Skinny by Ulta is from the "Denim" set, so it is the prefect color for the denim nails.
Wet a makeup sponge, then use it to dab on a lighter blue. Blue Suede Shoes by Sinful Colors is a good one. The first couple of dabs will be polish heavy, so dab the sponge on a piece of scrap paper first until the color lightens, then dab on each nail.
Use a fine detailing nail art brush and gold polish to paint the stitching lines. Create various patterns for pockets, side stitching, etc.
Add gold studs to represent the rivets, and seal them on with top coat.
(optional) Paint the Gap logo on the thumb with Liquid Gold.
Since jeans are not shiny (unless they are waxed), cover the design with a matte top coat.