This is a costume filmed in the Star Trek: Voyager episode 'Thirty Days'; wherein Tom Paris is demoted to ensign and sentenced to thirty days in the brig for breaking the Prime Directive in actions he took to try and save a vast planet-sized ocean world. This costume is for wear by Heidi Kramer in the role of one of the oft mentioned but rarely seen 'Delaney Sisters', Megan Delaney; a Starfleet uniform consisting of a long-sleeved, full-length, black jumpsuit featuring Sciences blue division colors across the shoulders, a Velcro patch for a commbadge, hoops for tools on the waist, a zip down the front, stirrups for the feet, and a sewn in tag reads "Voyager, Heidi Kramer". This is the only episode to feature Heidi Kramer/Megan Delaney, though in an elaborate holodeck costume, and the filmed scene with her in uniform was unfortunately cut from the aired episode.
A long-sleeved, blue-gray, undershirt with backing to attach rank pips on the right side of the collar is pictured with the original IAW listing and came with the costume though it is labeled for a different actress and used in a later season.
Screen-caps of Heidi/Megan, and her twin sister, are included for reference from this only on-screen appearance though wearing a different costume.