I have forever been looking for a pair of tights that don't roll down and actually FIT, and I've found them - through a Facebook ad of all places. Just thought I'd share them with you ladies like me...
Snag Tights
I've had them on all day so far and not had to pull them up once. 
P.s. I don't even work for them I've just fallen in love, but if they fancy paying me I'm open to it!