I sized up in 881w actually. My standard size was like leggins; especially bellow the knee, even I could button up all buttons. Denim is super comfy and "expensive looking", one of the best washes.
Sizing down in 881W is only for braves IMO
based on the belt loop placement, fly details and stitching and maybe back-yoke construction I would say it's Thavar / Thanaz cut. Plus it's straight leg cut.
Leg opening measurements seems to be kinda off.