Skinny jeans that don't bag and stretch

[rosieliveson1]

I have been wearing Next everyday denim leggingsor a while now but they seem to have changed the material and they are now baggy/saggy around the bum and knees within a few hours of putting them on. The material is so stretchy now that has no 'snap back'.
Any recommendations for 'skinny' jeans that are truly skinny and stay skinny. I want some that I can zip into boots this winter without having lots of material sagging around the top.
Restrictions are that I'm a size 18 so need to be able to shop that size and I've not got lots of disposable income for clothes so £30-40 would be a maximum I could spend. Ideally less so I could get a few pairs.

[alwaysalaughtobehad]

I really like the Miss Selfridge Steffi high waisted ones. I live in mine and they do last well!

[goldiesoxx]

I love matalan jeggings. They stay skinny on your leg, are comfy on the waist and look like real skinny jeans. I have loads of pairs.

[lavazzzalover]

Primark super skinny. So flexible and tight. £10