The first and best feature is comfort. It's complete loose and you won't have to worry about eating too much on a day when you wear a jumper dress. You can eat as much as you want with no damage done or maybe I should say minimal damage to your overall look.
The second feature that I love is the layering. It's either a turtleneck for winter, a simple crew-top for summer, maybe even a cute button down to make it a bit more formal, or lastly you can wear it with nothing at all for the ultimate relaxed state.
Third. Leg coverage can also vary from leggings, to tights, boots or flip-flops.
From runway to real life jumper dresses are one of those things that you need to have at least one because it works for so many occasions and it can take you out of a pinch on those days when you don't feel like wearing something that's super fitted.
Enid P. "Dare to Dream"