Well if you can go down a size you should but jeans should always fit your waist. That means they can stay on your waist without a belt even if you jump while not being uncomfortably tight. So, you should get jeans that fit your waist and have a taper. I'd personally recommend Levis 508 in rigid envy. The 508 has a nice taper and a lot of thigh space. Having the rigid envy wash means it'll look similar to the jeans you linked.
There aren't really any washes that seemed appealing and they're also technically discontinued so not super easy to find in stores.
they're these in black
I'm gonna give it a go here.
Pants, in British Khaki color, up to size 42
522 is good, 521 if you can find them. 508 is also good, tons of sizes on amazon right now.
i love my raws but i still prefer these for black denim. order a few sizes and plan on returning because their QC sucks and they always have a bit of variation.
edit: these may work too
What's the difference between regular Levis and line 8 (twill) levis?
What is your favorite Levi cut and why is it the 508?
One difference is that the Line 8 are 98% Cotton and 2% Elastane, they say "stretch" on the tag. I tried them out at JCPennys, didn't really like it to be honest. They were way too stretchy, almost like spandex and it made them hug like tights and unlike jeans.
Nonetheless the color I want ["3D grey"] only on this line. My question is: how do these stretch over time compared to the non stretch jeans? With normal jeans you buy a bit close off the rack anticipating that they'll let out, but do the stretch ones let out the way that the regular ones do, or do they moreso keep their shape/size? This is going to determine whether I get a 34/36 | 30/32.