It looks like Mon Mothma is wearing a simplified tabard variant of her Revenge of the Sith robes over a jumpsuit or leggings (the side fastenings of the tabard may be concealing a waistline, but Rebels is very pro-jumpsuit.)
Ceremonial but practical, this is a neat way of maintaining Mothma’s air of dignified authority whilst logically placing her mid-action. I believe that by this point Mon Mothma will have left/fled the Imperial Senate, so this look is very much a statement of intent that she is continuing her role as senator and representative of Chandrila, even as she is fully and openly wearing the role of Alliance leader. A militant adoption (arguably along similar lines to the influences of Padme’s Mustafar costume.) This is also another case of adaptation of costume from one medium to another: live action to animation. And within that, the fairly rigid aesthetic of Rebels which is made of clean simple silhouettes, leaning towards the utilitarian.
The Helix Nebula in Infrared : What makes this cosmic eye look so red? Dust. The featured image from the robotic Spitzer Space Telescope shows infrared light from the well-studied Helix Nebula a mere 700 light-years away in the constellation of the Water Carrier Aquarius. The two light-year diameter shroud of dust and gas around a central white dwarf has long been considered an excellent example of a planetary nebula, representing the final stages in the evolution of a Sun-like star. But the Spitzer data show the nebulas central star itself is immersed in a surprisingly bright infrared glow. Models suggest the glow is produced by a dust debris disk. Even though the nebular material was ejected from the star many thousands of years ago, the close-in dust could have been generated by collisions in a reservoir of objects analogous to our own solar systems Kuiper Belt or cometary Oort cloud. Had the comet-like bodies formed in the distant planetary system, they would have survived even the dramatic late stages of the stars evolution. via NASA