See post #6489487.
Her outfit consists of a black crop top exposing her underboobs, pleated black dress, black pantyhose, black thigh boots, and a black hairband. Her rigging consists of two of her four planned 203 mm triple gun mounts on a dragon-like automaton.
The fourth shipgirl introduced as part of the sixth wave of Priority Ships, Hindenburg is basically an upscaled version of Roon, using the same 203 mm triple mounts, but her hull is based off the Admiral Hipper-class to accommodate an extra fourth gun mount and four 533 mm quad torpedo tubes. Another note is that her size and displacement is similar to a battleship.