The American Apparel Riding Pant. I fell in love with these about a year ago and got them for my birthday March (post here). They are a very thick material and are pretty tricky to get on, but once settled they are super comfy. Tucking t-shirts in is also a task as they really are very high and the material shows up the scrunches of t-shirt if you don't do it carefully. Having said this I love wearing them because they just feel so great when everything's sorted- (until you need the loo...)
Here I've styled them with an American Apparel top I bought a few years ago. As the top is so thin it tucked in nicely and I liked the colours together.
These are the Joni Jeans from Topshop. I first bought them in pale blue (see here) and loved them so much I got them in black too. They are really stretchy and pretty comfortable, I pretty much wear them like regular jeans, just tucking my top in. They're also good for Autumn/ Winter because you can wear crop tops and not be too freezing!