Amazon Essentials Women's Mid-Rise Stretch Pull-On Jegging (Available in Plus Size)OEKO-TEX STANDARD 100

Do these fade fast? Black trousers have the tendency but some more than others, so wondering if they’re worth the money?

Are these true to UK sizing? I’m usually a 12-14 so wondering whether to size up or down?

im 5ft 10 which lengh would i need