what makes this interesting is, you see that seam? that’s why her ass looks so great, the outer panel is squeezing it in for display

denim used to be an alternative to canvas “duck” for tarps and tents, blue jeans used to be sold incredibly stiff as work pants to be broken in

but they were adapted as symbols of countercultural youthfulness in the 1950s and 60s

in the 70s there was a trope of young girls obtaining jeans too small to fit into, putting them on in the hot bath (where the fibers would slightly relax) and having them dry skintight

by the 1980s you had the then-resonant trend of “designer jeans” (so resonant that genetic engineering was riffed off it as “designer genes”), denim designed as fashionwear

you had Calvin Klein, and the Brooke Shields commercials that riffed off her as a barely-pubescent sex symbol, “You know what gets between me and my Calvins? Nothing”

Cause she’s 15 and she wants you to know she’s not wearing underpants! 1980!

Anyway, also part of that was the development of acid-washing (loosening denim fiber by chemical action) and stone-washing (loosening denim fiber by mechanical trauma)

got to the point where by the turn of the 90s, light-blue jeans with obvious damage, esp. shredded knees, the antithesis of the solid dark-blue workman’s pants, were in style