See post #2441827.
Her default outfit is the Yuugumo-class school uniform: a purple halterneck dress over a white shirt, a teal-blue bowtie and grey opaque pantyhose with lace-up boots. She wears her rigging on her back as a backpack with a single oblique yellow strap. Quadruple torpedo launchers are strapped to her thighs, and she wields a twin-cannon 12.7cm turret with both hands.
Hayshimo has very long black hair in a modified hime cut with her bangs covering her right eye, hair ribbons somewhat like Hiyou's, but wider and not tied into bows, and a generally flared but clean-cut appearance. She also has red eyes.