I seldom buy new clothes and like 'preloved' jeans which have been washed and softened, so I look on eBay first. I am an apple shape too, small hips and slim legs but a big waist and spare tyre. I got a lovely pair of stretchy denim jeggings, they are by Dorothy Perkins and the style is Eden. I particularly like that they have belt loops as well as good back pockets. I was so pleased with them I searched eBay for some more, and have bought the same style in the same size in light and dark indigo, grey and black. The weird thing is that they are all different - the darkest blue are much tighter in the leg, the lightest are looser on the waist, the black are a thinner fabric! Still, none cost more than £8 a pair.
My waist is such that the waistbands all roll if I don't use a belt. I dislike belts as the buckles always dig in but I'm forever straightening the waistband without one. Perhaps maternity jeggings have a waistband that would not roll down? There are some good ideas here.