They are another new basic: with looser sweaters and sweatshirts for example, or with a jacket and a loose t-shirt (with curved hem?). Footwear: heels or high tops as a starting point? With boots, depends on boot style and shape, try them on.
Yeah, its difficult to say without knowing the fit.
If they are skinny slim then longer tops not tucked in; silk blouses in the evening, jumpers during the day.
I guess the wider the trouser the shorter and slimmer the top would be a good rule, but nothing tucked in.
If they are really skinny, then the trendy thing is to dress them down with converse during the day (with a longline jumper). If they are wider then I'd leave them for evening wear, with a heel, stiletto or block heel, not a wedge. Shoe or boot.