Here we see Sumati in her "halved" body shape out of solidarity with her girlfriend Tria. To protect her rump stump, she's wearing a contraption with pillows protecting her stump, and which also makes sitting on her stump more comfortable.

Don't worry, her back side isn't gone. She keep it safe in her quarters when she's walking around the ship like this ;)

Drawn in Inkscape

Uniform outfit (+ backstory)
Uniform outfit, halved
Casual outfit
NSFW naked