Night out outfit needed please

[Smugfearnleyshittingstool]

So I've lost a stone since having dc3, so I'm a size 8, 5'4 ,with big breastfeeding( but saggy:( ) boobs. I usually wear leggings or skinnies with tunic style top if going to pub with friends. We're going out for a friends birthday in a few weeks and I feel a bit mumsy in my mostly fat face / whitestuff clothes.
I live in flat pumps or converse too, as I'm not sure if leggings and heels are ok.
I suppose at 32 I want to be a bit trendier but don't really know how! Any ideas.... I do like the look of oasis cherry jeans but what with and which colour?

How about a slightly vintage vampy look? LBD and killer red heals?

Yes to Oasis Cherry - a zillion times nicer than leggings imho. Maybe with a fairly loose silk blouse and wedge heels?

Thanks...off to look UP campy lbd and silk blouse! I tend to look a bit washed out in pale colours, and most of the blouses I've seen are beige, sandy. I'll try and find metallic coloured one. A friend wears bright colored belts, it seems fashionable, but I'm not sure it's me really!