An abaya gives you space. You can walk, sit, move around, and nothing feels tight or restrictive. There is no waistband digging in and nothing you need to keep adjusting throughout the day. Most of them are made to flow, you should feel like you are wearing the garment and not that it is wearing you. The fabric moves with you instead of sticking to your body, which makes a huge difference when you are busy or out all day.
There is also a different kind of comfort that comes with wearing an abaya. Knowing you are covered and modest means you do not spend the day thinking about your outfit. You just get on with things, and that feels freeing.
An abaya works for so many parts of the day. You can wear it at home, outside, for moments of prayer and also for running errands. You will never need to change in between. That simplicity is what makes it such an easy choice.
For a lot of women, once comfort becomes important, the abaya naturally becomes something they reach for again and again.