I've always been able to buy jeans in Next; haven't changed size in 30 years... could pop in or buy online, job done.
I recently needed to replaced two pairs that have sadly finally fallen apart.. went in, had to try on several different styles as the sizing seemed a bit variable.
One wear of each and they just went saggy and loose! Usually I get a least a few days out of a pair of jeans before they need washing to tighten them up!
Can anyone recommend somewhere else? I'm a pretty standard 10 most places.