Bunny Jumper available from ASOS
The best trick is to wear it with a pencil skirt, yes it will still suit certain better body types more then other but give it a try. This is probably the most 'in' way to wear it this season as well.
-Though baggier sweaters are what's in, shop around to find a length that flatters you, shorter girls can benefit from finding a longer slimmer style they can wear as a tunic with tights.
-Another thing you may want to consider are the body hugging styles, I find these work to flatter bustier girls because they nip in at the waist instead of hiding it.
-Think about the colours as well, if you wear lighter colours, it will look bigger, while darker colours will look smaller, the great jewel tones that are in are wonderful as they will make things appear smaller!
-Don't forget about hair. a loose high bun will add height (not too smooth or it may make you look a little odd). While leaving long hair down is a slimming look.
-Also you can add heels, Sky high and chunky are still having a moment and aren't as hard to walk in as other styles.
I think the best make-up you can wear with this is a slick of bright lipstick, perfect to polish it off and finish your look.
Ultimately the trick is to counterbalance, if you wear something baggy on top, be sure to bring your look back to flattering with something slim fitting on the bottom!
I hope I've given you some help on how to navigate this trend! Let me know how you style it.