I have never owned a pair of skinny jeans that actually stay up, I spend half of my day having to pull them back up and readjusting them. They're my preferred 'uniform' so to speak so I wear them most of the time! I buy cheapy jeans (under £25) which may be the issue but, even then, the one pair from Monsoon that I have are even worse for this. Should I look at investing in a couple of pairs of designer ones? My boss tells me that it's the way forward but I don't want to put that much money into an item of clothing that may turn out to have the same problem!
FWIW, belts don't keep them up either unless they are really tight, it just takes a little longer to slide down.