American-made jeans are anywhere from $160-300. I can also buy some jeans at Levi's for $60-100.
It is not as small as you depict and also not as large as you are responding to, but it is still a very real gap.
Comparing almost boutique level jeans made in the U.S. with mass produced Levi's made elsewhere doesn't help us determine price differences in off-shoring vs. manufacturing in the U.S.
I think what we would need to know is how much would a pair of Levi's cost if all of them were produced in the United States.
tl;dr: What is, isn't necessarily what could be.